Take the brushes out John - 2 spindles to knock through.
You can clean the brushes with hose and the inside of the brush housing with wiping.
There are 5 sets of brushes available for the Envirodri
black for hard ie hard floors
black & white
white
white and gold
gold - for soft ie wool
Personally on a berber I would start of soft and go carefully. I think your thinking that way too.
What brushes do you have?
They are about £90 +vat a set from Envirodri so not cheap.
I got 3 sets, white, black/white, white/gold