This is the stuff I used. Picked it up at Harbor Freight when I went to get the orbital buffer. It is supposed to be a polish/wax replacement but I'm not sure what it really is (i.e. wax, glaze, polish). Worked amazing though.
The glaze I use is very easy to apply. You literally just put it onto a microfiber cloth or something, rub it on the car, and then rub it off, then wax. Very simple and definitely worth the results if you have a dark car. And it doesn't leave any white spots like wax does if you miss a spot. :)
https://www.amazon.com/Meguiars-Mirror-Glaze-Show-Car/dp/B0002UQAM0
Oh sorry it's still Meguiar's polish, they've got a bunch of different numbers to indicate how fine the compound cuts. Like this here: https://www.amazon.co.uk/Meguiars-Show-Car-Glaze-473ml/dp/B0002UQAM0
Mirror Glaze 7 with a wool buffing pad after you wash it clean
https://www.amazon.com/Meguiars-Mirror-Glaze-Show-Car/dp/B0002UQAM0
don't let the buffer sit in one place or buff dry
you might need to follow up with swirl remover polish because its black
and don't try to get every last scratch out like others are saying you can burn through the clear