How do you clean the stain rainbows leave on your feet when they get wet?

I have the same problem and have found that the only way (at least from what I've tried) to get the stain out is to just let it wear off. If possible, don't wear your Rainbows for a few days.

I'm sure other techniques work, such as scrubbing your feet with a cleaner of mixture of things, but I have yet to come across one that works.