I have an engine on a stand, and am cleaning it piece by piece as time allows. I am using a wire wheel on an 8-inch bench grinder without the guard and have made decent progress so far. I know better than to try to hold the block and brush it on the bench grinder. Any suggestions? Chemicals? Wire toothbrush? Send it out? My preference would to do it myself, so I can take more pride in what I have accomplished. On the other hand, I don't want this to take forever, because I need this engine done soon.