With a BOAB you don't need to get a wet leg!
A good dunk with your aplicator in your bucket, and then into your BOAB is usually enough to do a complete semi with.
you are highly unlikely to scratch glass, if you pick up something abrasive enough to scratch glass with your applicator you can usually feel it in an instant, in 23 years of window cleaning I have personally not had it happen to me, ditto with a scrim or microfibre too.
I did have a customer complaim that one of the guys working for me had scratched her windows though!
Complete cobblers...there were all manner of scratches all over the shop, gave her the equipment the guys were using and challenged her to try and scratch the glass, she couldn't of course, then she tried to say it was their belt buckles and their watches that were causing the scratches!!
Threatened me with court action too, I just laughed at her and walked away...silly mare...
Ian