When first getting in the shower, wet hair and take 1 cup of white vinegar and distribute it over hair. I have mine ready to go in a glass measuring cup. Rinse WELL before opening eyes, and then shampoo and condition as you normally would. I do the vinegar first because otherwise it strips my conditioner off instead of the residues and hair products I want it to. This serves numerous remedial functions: dandruff, lice, improved hair shine, clarifying, just try it. It is cheap and amazing. Smell will disappear as hair dries.
Also,on another note white vinegar when applied directly to the scalp will cure itching scalp and dandruff. Just get a cup of vinegar and pour on the head let sit for 30 minutes. Rinse it off and do it again everyday until your cured. It works great. Try It!!!