graphite carbon spray like this(this is just the first one that came up on ebay there may be cheaper if you look) its a dry powder so doesnt hold dust or dirt like any of the wet ones do
also great for zips and awning chanels as it wont effect the waterproof of the fabric
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A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets