[Perfectlap]

the manufacturer of the canvas material endorses Raggtopp use, I'm sure there are other brands that work well at cleaning canvas as well but there's just not much feedback when it comes to Porsche.
I use a Renovo dry foam and a towel for quick spot cleanings like bird bombs and berries falling from trees. Raggtopp cleanser has to be rinsed out fully after each use and should be worked in with a super soft brush like the OXO feathertip. Then you have to reapply the Raggtopp protectant which has UV protection and keeps dust from getting into the threads. Dust is the big culprit, you want to rinse your top a few times a month.