Just do what I did. Go to any local shoe store or shoe repair/polish place, and buy one of those brushes that they sell for suede shoes. They have a nice wood handle and the bristles are soft horse hair. If it's gentle enough for suede, it's gentle enough for the canvas soft top. On top of that, these brushes are only $10-15. All of the brushes I've seen on the internet are $15-20 plus you have to pay for shipping, plus potentially brokerage or duty fees if they're from out of country.