I have always used 'Silky Cream Cleaner' for 'boats & caravans'.
That 40 years worth of doing my dads vans for pocket money
& for gain & reward,
never found anything easier or better for the money.
I then protect with MER, not very proffesional but it works.
george
PS, i have used Farecla as a cutting compound & with polishers, but these
have always been their abrasive products.(dont know if they do non abrasive now)
Not really advisable on aluminium or anodised coated surfaces.
& never on plastic windows