Use this for the first time the other day. Had not thoroughly cleaned the shaver, just open it and shake out the loose stuff, for a month. Used this for a half minute and tons of glop came out of the shaver. It only left a small skim of packed whiskers in the shaver blade holder, Norelco, which will probably come out on further use. Even if I have to brush it out the increase in how well my beard is cut is well worth using it.