Bleach and Betadine are very harsh on healthy tissue. I
recommend Oxine instead as it is safe to use on healthy tissue. Buy on
amazon.com, at $25 a gallon. You’ll mix a very small amount in water. You
can also use it for getting rid of thrush. I don’t have all the details for
use in getting rid of rainrot at my fingertips, but can get it if you’re
interested.