I used to use valve grinding compound for this job. Michele Hastings said she uses soft scrub. I think the grinding compound might cut a little better but the soft scrub is cheaper and a whole lot cleaner. Thanks for stopping by and as always, if you have trouble getting the video to play drop a comment and include the device you are using. That will really help me get the bugs out of this video thing. OK, one quick rant. Why don't tablet apps ever have any instructions? !!!