My iguana has some very minor burns beacause s/he like climbing the top of the enclosure. I know I need to treat her/him with a betadine solution, but what is the ratio? I have searched and searched, but I can't find it. Please help!!

There is no specific ratio - just mix it until it's about the color of tea and bathe him in it. You can also help burns by putting triple antibiotic ointment on them every night before you turn off his lights.

In the meantime, work on getting your lights fixed so that he can't burn himself. Once they get burned once, they are more susceptible to more burns. Try raising the lights so that he can't get so close to them. :)