Ok you can put rubbing alcohol in a bottle, put teh bearings in, and shake the bottle for 5 mins. then dry them off with a paper towel. spin them in ur hands for a bit too. (This is the same as the gasoline method just incase u dont have gasoline lying around)
Or u can get a container and soak hte bearings overnight in WD-40 or something similar. It WONT make them rust or anything. the new bottles are like boss.
dont use wd-40. it will eat your bearings