Polyethylene may soften slightly, and over time, acetone may gradually diffuse through it, but basically it's unaffected by acetone. In my lab, we always had LDPE squirt bottles of acetone available. Mostly used it for drying glassware and other lab apparatus made of .... polyethylene. A squeeze bottle of it can be used for drying coins too. If you are going to keep a squeeze bottle of acetone around be mindful of two things: 1. Both liquid and vapor are very flammable. 2. Use the kind of squeeze bottle that does NOT have a tube going to the bottom of the bottle. Acetone is very volatile. When it gets warm, the pressure of the vapor over the liquid will increase, and acetone will start to dribble out the spout. With daily temperature cycling, eventually the acetone will be gone. Even worse, the acetone dribbles are a fire hazard, and the acetone may damage the surface the bottle is sitting on. Cal