For at least 30 years I have used alkaline detergents to clean a variety of objects, old and new. I'm not sure how well known this stuff is but I was given some by a painter and decorator to try and never looked back. It's hard to explain how good this stuff is... you just have to try it and then you understand. It's good on paint, plastics, metals and combinations of these. Theoretically it should be diluted but as with the X246 I recently received, I used it neat with a green scouring pad that was already a little worn. If there's a stain or a mark that it doesn't get rid of, it's probably impossible! I tried to source 443 recently but couldn't find it anywhere so I opted for the closest I could find. It sometimes gets described as 'traffic film' remover but essentially it's just an alkaline cleaning agent.