I have used the brush and still do but a pad on an extension is preferred.
I rinse the brush and pad between use and dipping back, in the bucket of suds.
The brush mostly on windows and windshield.
Rinse it thoroughly before even starting. I use to decry pressure washers but on moderate and away from window seals and doors it will dislodge almost all grit and dust. it or a high pressure water hose is a must around lower edge and wheels. Newmar is right. I polished my coach once, never again, to get rid of spider webbing and worse. I will have to do the rear though.