I've got, among my large collection, the Tecbuk full boar

Is quite grippy on the glass, but makes double quick work of slug trails etc. Excellent scrubbing power. Better than any brush I've had so far for scrubbing. But, due to extra grip, can be a little slower cleaning through the day. Great for first cleans.
As regards the slow rinsing off, it really doesn't matter if you're brush off.