+1 for acetone method. I put a set in a tub with cheapo £1 nail varnish remover (with acetone on ingredients) Just stuck it on fridge n forgot about it. No smell this morning, gave em a shake off outside, any liquid on them quickly evaporated (no chemicals on my fingers
) and they peeled away real easy.
Dunno about my rims being brittle but Im yet to crack 1.
My 2 cents. I'd likely forgot about them in the oven and burn them/stink out kitchen or something.