My last order;
Creates a lot of dust though but obviously after compounding ect you wash the car down to remove oils, residues ect.
Deep swirls or deep scratches btw? swirls don't really get deep they're more like light surface scratches. Deep is most likely to be actual scratches and that to me would suggest you may need to wet sand and refine.
If however the scratches are below the lacquer they cannot be simply polished out they will need to be (depending on how deep) painted or re-lacquered, flat polished.
Hope this helps anyone care to add feel free