I have the big one and small one. Big one works absolutely perfect for dust getting dust and pollen off the exterior when a wash isn't needed. The small one is for interiors and it works well too. No scratches, no swirls, etc. They just removes the dust/pollen. Their slogan is "the dirtier it is, the better it works" or something to that affect and it is true. "California Duster" from Walmart, Advanced Autoparts, etc.