Because I do not use slurry a lot on my Belgiums they (expecially the yellow) will accumulate ??? grit, grime, metal,..whatever - I will clean the surface with my DMT 1200. It works better than the 3M Scotchbrite. If you don't have a DMT 1200, I suppose you could use any form of cleaning or scrubbing process. :shrug:
Regards,
Steve