It is usual practice to clean bearings with alcohol or a citrus cleaner; the latter is safer but more likely to leave residues. Since a citrus cleaning is water-based, you must quickly dry your bearings in order to prevent rust.

You can clean your grip tape on a skateboard or longboard with a portion of sanding belt cleaner or the entire block. Holding the sanding belt cleaner, begin section-by-section rubbing it on your grip tape from top to bottom in a straight line. But pay attention to the locations of the bolts. Gently wipe these areas down.