You have to be careful with plastic dashboards and other such plastics including on the outside open to sun damage, you need something designed to 'feed' the plastic otherwise it will dry out and eventually crack.

Mr Sheen and such polishes will be ok, but be careful about using household cleaners, i've seen these general cleaners cause thin soft plastic coatings to start to peel off.

FWIW i use AutoSmart's 'Finish' for plastics.

Edited by gordonbennet on 01/09/2020 at 11:16

When working as a car valeter in the dim and distant past, i discovered that for small nasty stains on upholstery, brake and clutch cleaner worked a treat. I remember the smell, i'm sure you could easily get high if using it in a confined space!. If memory serves, the brand was 'Wurth'.

This was 20+ years ago though, so no idea if current brake and clutch cleaner is the same or whether or not it would be safe to use on upholstery?.

As to boot polish, i remember my Dad talking about using it on tired looking vinyl roofs (remember them?).