ive been using microfibre cloths for 4 years now.i have one scrim cloth left!!
advantages?
you can use them straight out of the packet,no "breaking them in"
they dont leave cloth fibres on the windows like scrim
they last ages(hundreds of washes)
they are just better than scrim full stop IMO.
i buy em in packs of 10 extra large.
only thing is they can get wet pretty quick on a damp day.just make sure you have a load in the van.if your mainly WFP then you wont use more than a couple a day anyway.
best wishes
dazmond