What do you mean detailing?
when you wipe the edges of the glass, and mop up any fastest window cleaner marks on the glass.
I would boil wash you scrims a few times as said, then use as sill cloths if you can, if not 5/6 boil washes will break them in a little, break them in meaning they will start to work correctly and suck up water, pre washed scrims are a joke they still need washing, you could always try some microfibre clothes from unger or contico you can use them straight out the packet, I 99% of the time use the micro cloths now. but used scrims for years and no soap no softner no tumble dryer. 40d wash or 50 on micro scrim high as possible