I had hopes of the method on the website working but it doesn't look good so far. I tried polish remover which is diluted acetone on a badly yellowed A4000 drive bay blank and it didn't even touch it.
I really can't see how this person achieved the results in the pictures unless they are all nicotine stains that he is working with.
I have some yellowed Amiga stuff that I would really like restored, like my A3070, A1020, A3000T, A4000, ect. Hard to find. I have stronger chemicals, however most of them will eat the plastic.
Jeff