I tried a whole bunch of stuff, acetone included, and it made no difference. Just pissed me off so they had to go!I have a Nars eyeshadow palette that got sticky and gross like this. I had to scrub it with acetone in order to melt that matte coating off. Took a fair bit of elbow grease but the box is normal plastic again. I hate this coating on all products and avoid it now, even if I like the products.