I'm sorry to go against Mark and Sharon's advice , but using the awning cleaning brushes the have a metal twisted shaft is a complete NO NO.
The manufacturer in my opinion should be shot, the last thing you want to use near awning rail is any metal that you could end up damaging the anodizing with.
Awning beading (keder) is designed with a cloth wrap that should flow through the anodized rail, polish and silcone sprays should not be needed and can attract dirt to the rails slot or attract dirt to the keder that will also damage the anodising that in turn leads to corrosion that will hamper the flow of the beading through the rail.
Using care to line up and feed in clean beading/keder through a clean rail slot holding it away from the vans side to stop friction slowing is all that should be needed.
After market sprays and tools made of metal should be avoided especialy as most awning rails are made from "soft" alluminium.