I have at least 30 scrims and I am mainly wfp, I always have dry scrims available.
And a dry scrim works better than a damp scrim for detailing and polishing.
I can't go along with Ian on this one. Nothing beats a damp, clean scrim that has been washed without detergent, it has to be clean though.
Back in the late 50's before we had sqeegies we worked with one scrim all day.
It was washed frequently and wrung out by hand. I had callous on my hands from wringing them out. After wringing they were opened out and shaken like a rug to remove any last bits of water, and then folded into a pad. Dreft, if you can remember it was the only detegent ever used, and that for the first wash only after the boiling. Dai