We use those too Paul. Really good wash mits. TBH, we only tend to get 3 or 4 washes out of them before they start to fall apart, but at £6 for 5 you can't really argue with that.
We do use the two bucket method, but we don't use grit guards. We do virtually the same as Paul, washing the dirt/grit off the mit each time the mit is placed back into the clear water bucket. I also "scrape" any excess dirt off the mit in the clear water bucket on the edge of the bucket.
A.
