Glad to know
I had a choice of that Cream thingo , Brasso and Silvo . I started with the cream (car polish...) and that did the job .
Easier than I thought it would be.
Some caution using car polishes on Perspex, I work perspex for a living I have always use Brasso to polish perspex, a colleague once used some car polish, looked good at the time but whatever they put in the car polish eventually cause the surface of the perspex to get lots of micro cracks in it, it was so bad we could not see through it.
If the scratch is bad I try 1200 wet and dry first and if very deep I use 400 then 1200 then brasso.