Ive found that using stuff like this is mostly not necessary with the couple of grinders that I have owned.
Have found it to be far easier and a lot less messy to just remove the hopper and the top burr carrier every now and then, and then use a vacuum cleaner to suck all the grinds out from the top. If there are any stubborn grounds, just loosen em up with a toothpick or similar and then vacuum again. Only takes about 10 minutes all told and everything is spotless ;).
If you have a doserless machine like the Rock, e.g. then its only another couple of minutes to remove the spout and vacuum the discharge chute area. Very quick and very little effort.