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Acetone is a strong thing, will remove grease and also paint, will damage rubber, so your advice to be careful is absolutely correct. Acetone is also hard on skin so gloves are needed even though I find it difficult to work wearing gloves. I would take the windows to be cleaned out of the car as both the mentioned remedies are hard on many things in the car, including plastic. Nail polish remover without acetone could maybe also be used.

This post is dated 2004, but I'll reply. Based on what I read, PO440 Vapor Pressure Sensor and PO446 is the charcoal sensor. Check hoses for cracks. Remove fuse 20amp yello under hood, use the white tool provided on the box lid; remove for a minute or two and return tool to lid. Do not fill tank with gas.. keep at low level... the charcoal filter will clear itself. Hope this helps someone.