PolG

Got a 99k mk3 and I have noticed white dust/particles coming from the air vents. Had the air filter and pollen filter changed, pollen filter was stinking looked like it has never been changed. The dust like substance is still coming, especially bad first thing then seems to stop.. Seen other forums with people talking about Air Con, someone said something about air freshener which I think is rubbish, has anyone any experience? Or what's the best air con cleaner to buy from Europarts or Halfords? Not sure if it's starting to ease after the pollen filter was changed need to clean the crap up again and see if it returns... Another query is do the mudflaps from a salon fit the estate, seen a set of after market on eBay for £14 but all for Salon?