On 04/02/2020 23:58, alan_m wrote:
On 04/02/2020 22:15, Steve Walker wrote:

I think that the good ones contain solvent and effectively soften,
smooth and then as they evaporate, re-harden the surface of the uPVC.

I don't remember the make, but I used to have a can of the stuff my
uncle (who frequently worked installing door and windows) used to use
to remove any marks from both old and freshly installed units. It was
very effective.


Mostly Acetone

Yes, that's definitely a major constituent.

SteveW