If you really want to get into it, disassemble your bike down to the bearings and re-grease with a marine grade grease. Not much you can do with a cartridge BB other than remove, grease threads, re-install. If you got cartridge bearings in wheels and headset, schmear grease all over the outside of them; if you have sealed bearings in races or just loose bearings, re-pack with fresh grease.