Cleaning motor home concertina blinds

I wave the wand of the hoover at them after each trip......

Like you I suspect that if you wet them they will mark.....?

I'd like to know the secret of how to clean them, the black net part is a pain to clean. I've tried all sorts of ways to get the dust and fluff out off them. The roof one has sagged and its a pain trying to push it back into its housing. The solid blind cannot be cleaned with a damp cloth to remove marks as the coating comes off   to be honest these type of blinds are useless, we are thinking of replacing them with other types if we can.

We would like to replace them but it does look like quite complicated job. Expensive business owning a motorhome, seem to have to keep throwing money at it but that is the price of our freedom.