Replied by Ted (Bangkok, Thailand)
What worked for me was the lavender oil, which is applied with fair amount of frequency every 15 minutes for half a day, at least. But must be applied thinly enough so that the smell doesn't irritate the eyes. ACV and DMSO wouldn't work.
The other one that has worked with me was a 3% solution of zinc chloride and 5% solution magnesium chloride applied with the same frequency intervals.