Hi
You can use a polisher but can also use a foam applicator and do it by hand. The compound will remove swirl marks and minor marks or scratches, then use a good polish and a good wax. Autoglym is good, but there's better stuff out there. I don't use Autoglym.
I first pressure wash the car to get some dirt off, then use a good snowfoam, leave the snowfoam for about 10 mins, then wash off what ever is left, then use a good shampoo, don't use a wash and wax shampoo, but before all that wash the alloys with a separate mitt, anyway wash the shampoo off and then dry with a drying towel, I don't use a leather chamois as it leaves streaks and some marks, I use poorboys drying towel, once dry, use the compound, really rub it in but softly, wipe off with micro fibre cloth them polish and wax the car.