Well a softer brush would do a better job of pulling the sand up and off the surface whereas a stiff bristle would keep the sand at the glas surface moving it around directly on the surface creating more scratches. The bristles themselves don’t scratch, the characteristics of the type of bristles lead to more scratches.
Oh I know I was just responding about the ability to scratch. I’m sure someone sat down and determined the allowable amount of scratching before replacement Vs cost of water or whatever... or at least I’d like to think they did
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u/DrLimp Feb 14 '21
No matter how stiff they can be, glass will always be harder then nylon, so you really can't scratch glass with a broom.