Wolfstein's Pro RaggTopp Natural Horse Hair Cleaning Brush for safely and gently cleaning leather, vinyl, and plastic. 

This is a special brush from Raggtopp the leader in all things related to convertible top care, cleaning, and protection.

The best brush you can get designed firm enough to clean your interior, fabric or top, but soft enough to not damage it.

This Raggtop brush's bristles are made from horse hair, which is nonabrasive, naturally soft, durable and designed to gently remove dirt, debris and stains from fabric, leather and vinyl surfaces.

Sold as individual brush as seen in pictures with hole for hanging on a hook.  The perfect size to get the job done.

Also great to use for home application like cleaning furniture.

Beware of imitations as there are some that look identical, but not made in the USA and not the same horse hair material.  So using an imitation could damage your top or interior material.