I personally use Autoglym shampoo conditioner car wash (green label) and carplan triple wax to clean my mint red '89 XR2. I add 1/3rd cap of wax and 2 caps of shampoo and mix with kettle of boiling water then top up bucket with warm water (not too hot mind).. cleans the paintwork and glass brilliantly! The thin layer of wax easily lasts till the next wash/around a week and the autoglym wash removes all traffic film and road/brake dust..

I occasionally super resin polish, the wash doesn't remove polish and wax.

Highly recommended.