One system for all cars?

No, still too many variables, including the definition of 'moderate' swirls. Basically, just start with the least aggressive solution and only go more aggressive if necessary.
 
Defining a swirl or scratch is very very subjective. Many people here call micro marring "swirls" and other's with very deep scratches a swirl as well.



Do to that fact, it's impossible to give an easy answer.



The general notion that we go by is:



Use the least abrasive product needed to remove the defect.



With experience, you'll get a feeling for which works best for which defect but until then:



Also, do you intend on removing the swirl with a polisher or by hand?



Start with a Swirl Mark Remover and polishing pad. If that does the trick, then next time, try a paint cleaner (SEC GEPC Vanilla Moose). If that doesn't cut it, try a cutting pad. If that doesn't work, then either try a wool pad or move up to a fine cut cleaner with a polishing pad. If that doesn't work, try a FC with a cutting pad.



No go, then you have a scratch and probably not a swirl.



Move up to a Medium Cut compound and cutting pad. Then a Swirl Mark Remover polishing pad. Complete it with a hand application of a paint cleaner. Then the topping of your choice.



Paco
 
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