Lets say you had an area on your xbox case masked off and paint happend to slip under it, well heres the tools you'll need:
Raid
Paper towels (Folds of 8ths are Recommended but its up to you)
the part that paint slipped under
water

k now the one of the paper towels and put water on it, then put it down, now take another paper towell and spray some raiden on it, now rub that spot till it comes off, give it like 2-3 mins to dry, now take the water'd up paper and wipe the spot that you just rubbed to clean it, now let it sit and dry

Ill put some pics up in a few days, im going to va beach in a few