How do you get a stain out of fiberglass? This is for my braces retainer bottom that is yellowed.?

Question

I have tried bleach and limeaway, but they didn't do anything. How can I get it to go clear again?

Answer 1

I used to soak mine in denture cleaner, such as Polident.

Answer 2

Have you tried plain old denture cleaner?  Its made to clean stains off of dentures, so it certainly should work at your retainer and will not damage it.