When you want to fix the bearing and clean it out you dont really want to use wd-40 cause its a lubricating agent and thats the problem with it. Your best bet is to spray out with brake or carb cleaner from the auto parts store (1.99 a can). take out bearing and spray off the needles and rotate them around with a Q tip. dry it off and blow out with a compressor if you have one. Install and will be like brand new. The da will work well too but takes more time.