
After many years, this finally did the trick.
I cut off as much of the bad nail as I could, even parts of the top of the nail. (This would be especially easy after a good bath or shower, or after soaking the foot for 20 minutes or so. )
Then each night, before I retired for the night, I taped a cotton ball to the top of my toe with scotch tape. I taped all around the toe so it wouldn't fall off. Then I soaked it with white vinegar. I slipped a sandwich baggie over the toe, then slipped a sock over the foot to keep the baggie on the toe. I did this for about a week. After about that time my toe was a little irritated (but not until that long), so I didn't do it for a week or so. Then I did it again for about a week.
I started noticing a difference after 2 or 3 weeks. Sure enough, that did the trick, and it was a lot easier than soaking my foot for 20 minutes. Not only that, I had tried soaking it before, but it was hard to keep up the routine.
I think part of the trick was to cut back as much as possible. Then, the overnight soaking killed the problem. It took a long time for the nail to finish growing out, but my toe is 100% normal now! Ah, finally! I just thought I ought to forward hope and a solution to the suffering.
Iodine

My wife and I found that taking Lugols orally has resulted in clearing up both of our toe nail fungus problems. We try to take at least 5 mg /day.
Black Cumin

Peace upon all of you, I used black cumin (Nigella Sativa) for internal and external fungus and it give me a very good result, I think if you use it for Jock Itch it may give the same.
The way I used is: grind it then add ACV, let it stand around one hour to be a soft paste, take internally one teaspoon 2 times a day (before or after meal).
I used this paste externally for skin fungus especially feet fungus and it gives magic results and cure it forever.
Don't grind alot of black cumin, just prepare for 2-3 days every time and keep it tightly in a jar because it oxidize by air.

I have successfully used castor oil to treat toenail fungus. My baby toenail was completely taken over by fungus. It had a black line running through it as well (another sign of fungus). I did this treatment twice per day until the nail grew out: First, I put two drops of vinegar on the nail. Then I placed a bit of cotton soaked in castor oil directly on the nail and kept it in place with a bandage. The nail is completely healthy. It's been almost two years since the treatment.
Apple Cider Vinegar, Coconut Oil

Well, I am not positive, however, all I can tell you is that after years of fungus on my two big toes... It's now gone!!! You name it I tried it... I thought it was from salon pedicures, then, I thought damage to my nail beds from running and maybe my toes hitting the top of my shoes... Well, needless to say... I just couldn't get the fungus to go away!!! Then my life was changed by this site! I started taking ACV (Apple Cider Vineger) and VCO and I am now fungus free! I was taking the coconut oil orally ( 3 t. a day) and it made me bloated so I didn't take it for more than a month I'd say... However, I did use it as a moisterizer every night after my shower and I would specifically rub it around and under my toe nails... I cannot believe that the fungus is gone!!! Honestly! I share my story every where I go! Nail shops really need this information to pass onto their clients... Fungus makes you feel so dirty... My beautiful toe's have returned! Thank you! Earth clinic and friends!

Castor Oil is the best thing to cure nail fungus. I've tried so many other cures and none of them worked. Castor Oil penetrates deep into the skin and is useful for skin problems, such as cysts. It's amazing to see all the useful problems it can be used for. It's oily but it cures.
Hydrogen Peroxide

If Nothing helps toenail fungus, try:
Fold down 2 napkins just to cover your toenails and toes completely, then pour with 3% H2O2, wrapped with a polyethylene(cellophane, etc soft film), needs good plaster to fix on feet all the night and wash your feet in the mornings with laundry soap. Needs 10-14 days. Hope you get rid of fungus forever.
Don't forget to change all your socks, sandals&shoes/ or at least pour shoes with ACV every time.
Thank me later.
Essential Oils

I've suffered with it for years ive tried over the counter ointments from pharmacy none are that effective it takes for ever to get an improvement. I tried Oregano and Clove Oil Essential Oils they both kill fungal and viral bacteria. I also added Carrot Seed Essential Oil to encourage the skin to heal and reatach to new growth on toe nail. I used Coconut Oil as a carrier oil. I cut the nail right back to take away the home for fungus (I know you are meant to leave it at it can cause in growing toe nail in new growth).
I had instant relief from pain in my nails cause new growth happened rapidly. Now 3 months on, I have healthy pink toe nails and I'm not embarrassed to get out in public. New toe nail growth has attached to my toe for the first time in 10 years.
Garlic

I had read on Facebook, a cure which is fantastic. You mince or press one garlic toe, to 1 tbsp of extra virgin olive oil. You mix well & apply to clean feet. Be sure to put under toe nail & cover down to toe bed. Try to use the whole mixture. Then wrap the entire toes in Handi Wrap. Be sure the toes are cover tight. Then wrap with heavy foil around the toes, be sure to cover all the Handi Wrap to about almost have the foot. I use duct tape to keep it nice & tight. Then put on a loose socks & then a tight pair second over the foot. This will create heat. Leave on for 24 hr. Then remove & dig under the toe nail & clean it up. You will be in shock how much it loosed up. Then if possible do a second day again. During the breaks soak feet in Organic raw apple cider vinegar with (The Mother). Put about1/2 a cup of the vinegar. Then warm water to cover all the toes. Soak for at least 1/2 an hour. Like to watch T.V. Later on after shower, spray toes with a straight vinegar & air dry. really easy you only have to do the garlic treatment for extra boots. It won't take long to see a huge difference. I promise you will love the results.
Vitamin E Oil

Vitamin E oil works for me. Of the top ten nail fungus remedies, I have tried all but bleach and garlic (and I already eat an anti-candida diet). When I remembered reading about vitamin E oil, I added that to my nightly routine. Get a cheap bottle with lots of capsules. Pierce one with a safety pin then squeeze onto toe nail as described above. (The oil comes out easier if the capsule has been left on the counter for a while.) I do this twice a day when I am home and wearing sandals all day. If need to wear socks when going out, I put more oil on after I get home and back into sandals. At night I wear moisture-wicking socks (not cotton) and try to keep my feet out from under the covers so no moisture builds up on my toes. One-third of one toe is perfectly clear, and one-fourth of the other big toe is perfectly clear, after four months of treatment. I use Vicks under a bandaid if I must be in socks for several hours or more.

The first time I experienced toenail fungus, years ago, I tried tea tree oil without success. I eventually saw a doctor who prescribed Lamisil pills for 24 weeks. That worked. The second time I had a fungus infected toenail, over 10 years later, I applied iodine. A single drop in the morning. Probably another at bedtime (I don't recall now). Iodine worked brilliantly! Without risking liver damage (i.e., Lamisil).

Yes, I too used iodine for curing toenail fungus infection. And it worked so brilliantly that my fungus infection got vanished just after three weeks.
Bleach

I am on my second month of soaking my toes in bleach and water to see if I can get rid of nail fungus on one of my feet. It seems to be working. FINALLY! I have tried every other nail fungus treatment on the planet, including laser treatment, to no avail.
I read about the bleach cure from someone on Earth Clinic. I have been using Chlorox bleach (regular, not the splashless one)... about 1/2 cup to a half gallon of hot water in a large plastic bucket (the kind you'd use for mopping the floor). I soak my foot for at least 1/2 hour, sometimes more, once or twice a week. I make sure to dry off my foot with a white towel and then hop to the bathroom to wash off any remaining bleach so I don't turn our carpets white!
If I fly, I make sure to do the bleach treatment on my foot the day before flying in each direction if possible.
Will update again in a few months, but so far, thumbs up on this cure.

I tried everything under the Sun for fungus on my fingernails (bleach, hydrogen peroxide, rubbing alcohol, fennel oil, Vicks etc.). Purely by chance I discovered Birch Essential Oil when I was using it with coconut oil to help with cellulite! I would put approximately one Tablespoon of coconut oil in my hand, add 1-2 drops of Birch essential oil (too much is not a good thing!!! ) and rub my hands together until well blended. Then I would massage it on my legs, butt and belly after my daily shower. After a month of this I realized I no longer was getting inflammation under and on my cuticles and my nails were growing out. I only wish I had before and after photos to show how amazingly well this worked.
Baking Soda

I have been battling toe fungus on 3 toes for years. Vinegar, borax and now baking soda soaks have all slowly helped. I feel like I'm finally on the home stretch and my nails are looking healthy again.. thanks to baking soda. I wish I'd thought of this at the start! I am still soaking for 20 min daily. I alternate between straight vinegar, borax in water, or baking soda in water. All have helped. But what has really seemed to help is putting a little baking soda in the toe of my sock! I'm sure that not wearing socks and getting sun on my feet will help when the weather gets warm, but during the cold months, baking soda in your sock keeps them in an inhospitable environment for fungi all day long. I also give them a little dusting of it before I go to bed. I hope this helps! I will never get another pedicure. Now, I really prize the look of healthy natural toe nails!
An update:
I have switched my application method to using a finger cot (cut a finger off a disposable glove to achieve the same thing) and a piece of cotton wool soaked in 0.1% Benzalkonium Chloride.
I apply the soaked cotton wool to my infected toenail, put the cot over my toe, and leave it for somewhere between 1-4 hours depending on what I'm doing and how forgetful I am on the day. (Even 1 hour is probably overkill if I'm being completely honest.)
This works really well to get the solution to soak right through the nail, I have been having good success with only one application a day, and the only caveat is this:
I no longer use crushed aspirin because that caused some minor irritation to my nail bed but it's unnecessary anyway as I am definitely getting a thorough application penetrating right through my nail this way. (Likewise, there is no need for soap as the solution has nowhere to run off to.)
I would recommend this new application method wholeheartedly.
I reuse the cotton wool and the finger cot until they look bad, then I replace them. I have little concern about reinfecting my nail by doing this because both get absolutely soaked in the solution which kills the fungus so I don't see it being a problem however if you are not seeing progress you should switch over to a strip of tissue folded up appropriately before soaking and applying and then disposing of it after each application, and likewise for the finger cot. (This is where cutting a finger off a disposable glove would be ideal because you will get 5 day's application from a single glove so it will be quite economical this way.)
10-Undecylenic Acid
Laura, Can you comment on the brand or type used? Is it a pill, or liquid? Internal right? Thanks!
Castor Oil

Castor oil is so easy to use and works better than anything I have ever used. Just apply it to your toenails and toes. It penetrates the skin and the nails.