Brush For Fabric

[goose28]

What would be a safe brush to use on a fabric convertible top?
Not soiled but does have two quarter size spots.
Raggtopp fabric kit on auto geek order list.

Thanks.

[SON1C]

iirc that big brush that uses boars hair, mike uses it in one of his 50+ minute car wash videos, expensive but look like it works excellent

[goose28]

Thanks.
It is a nice brush but beyond my budget.