Right, so we all turn the water off and scrub to get them off? I tried something different today. I wear a set of bags when I'm cleaning (keep my keys and cloths in them). What I did was wet the glass and I wrapped a micro fibre cloth round the brush. Scrubbed the glass with the cloth on and then WFP the glass. Sounds time consuming but I reckon it's quicker than scrubbing the life out of the glass.
Give it a try if you haven't already 👍