Does anyone known what is best for removing scratches from sills? A fellow windy from a neighbouring village has asked me to find out. He is a bit older than me and doesnt really do the internet thing lol I have told him to buy a sill brush as when I used a toothbrush style brush I scratched some sills (luckily no one mentioned it to me). He had a customer complain and after checking, sure enough he said he saw scratches which he agrees were probably down to him cleaning sills with the brush. Any idea guys? TIA.