Johnny Brown you tip theiving get! I was about to advise the use of vegetable brushes. Mine however did not come from some gypsy hardware store, mine came from Ikea - a root vegetable brush shaped like a spunk. It boasts super stiff bristles and an attractive shaped head (!).
You've got to include an electric one I reckon For the "well heeled boulderer" :D
failing that I'll pick one up next week as I will be passing it then sometime..
. You don't want to find yourself on your deathbed years from now thinking "if only I'd have tried different brushes".
it's impossible to have a passing visit to Ikea - you are destined to be trapped in the miles of corridors, and to fill your basket with night-lights, candles, rugs you'll never ever use, and other nice but superflous junk.
Maybe its time to spread your wings and move on. No use crying over split milk, just pick yourself up - theres pleantly more fish in the sea. Your old brush would want it this way. You don't want to find yourself on your deathbed years from now thinking "if only I'd have tried different brushes".
perhaps its time to move to 'caving', I know this is a deviant pasttime and running away