On Friday, 12 July 2019 17:44:55 UTC+1, Harry Bloomfield wrote:
After serious thinking Jim GM4DHJ ... wrote :
I had an MOT advisory this year of "product on headlights"....do they think
I'm a boy racer in a fart can or what? ......I'm just going to use toothpaste
and an old toothbrush ......product my arse......

They are easy to polish up with toothpaste, autosol, or colourcut, but
once done they will decline more rapidly, because the UV coating has
been removed. I would like to know what UV coating works.

Not no way. I spent absolutely ages trying things like that - both manually and using power tools. Made not more than the slightest impact. Had them done by a friendly local car fixer using a serious grinder. The frosting effect was far too deep to expect things like toothpaste or T-cut to work. The result was not perfect but good enough to get through MoT and see where I was driving.