razor blade on the windows. for the stickers on the paint - i've used solvents and basically dissolved stickers while peeling away at the mush and it takes forever to do a small area. the best way i've found for taking off stickers from paint was to get the sticker very hot, peel up a corner with your finger nail, then peel back slowly not applying too much force. i've done this on very hot and sunny summer days where i didn't need anything else to remove the sticker...but, since it's winter you'll probably want to use a hair dryer and heat the crap out of the sticker in small patches as you remove it.