Strange stuff, MicroFibre - you need to moisten it to dry windows!
I use two - one for buffing and one for wiping up (sill cloth) and so I don't get them mixed up, I have them in different colours in a twin pouch - hopefully fool-proof, but . . .
The buffup cloth gets a light misting from a trigger bottle with water and GG3, with occasional top-ups, and the sill cloth just gets used dry to start with and gets wrung out every so often.
I know I used to just hang up a clean, but used, finishing scrim and it would be OK the next day, but you really need to wash/rinse the "dry" microfibre after a day's use, as it holds so much dirt. You must wash microfibre cloths by themselves, (not individually, just ALL microfibre cloths together) don't use detergent, and definitely NOT any type of conditioner - this seems to clog the poor little microfibres up and renders them useless for wiping up properly.
For anyone who just can't see past scrim, I've got half a bale of the stuff bought direct from Ulster Weaving Co which is now surplus to requirements. From my last visit to their site, it now looks like they don't produce window cleaning scrim any longer, I know when I bought it they weren't still producing the grade I'd bought from them previously - buy yourself a piece of heritage, snap it up quick. Ideal heirloom for a family window-cleaning business!