After a ride in the rain I cleaned and oiled my drivetrain. Somehow I got oil on my rear rim and braking is uneven. My first inclination was to use windex to get the grease off of my but I recall doing this on my MTB and having a squeaky braking problem for quite a while. What do you guys use to clean the braking surface of your rims when you get oil on them? Suggestions welcome and appreciated!