@EmilySalzsieder You should take the wheels off and take out the bearings. Strip them down and throw them in a cleaning solution. I use acetone/mineral spirits but citrus degreaser may work as well. It's definitely a good thing to learn how to clean bearings but you could just buy a new set if you really wanted to as they aren't very expensive. Here is a card I posted about cleaning bearings, I hope this helps! http://www.vingle.net/posts/497496
I wouldn't try Goo Gone it's a bit strong, I bought Greased Lightning Orange Blast I think it was 2.97 and the bottle will last a long time for now I'm using an old pill bottle for my bearings... I'm gonna make a bottle to clean em in or by the Oust kit.