Always start with the least agressive and work your way up, you can always remove more clear coat, but you cant put it back if you remove too much. Saying that, SSR1 applied by hand will likely not do a lot as its not too agressive. SSR2 will do a good job though. SSR2.5 is quite agressive, even by hand, so can be good for more major corrections, but in all honesty, if you cant really feel them with a finger nail, try Dodo Lime Prime, its great for a pre-wax clean too when you give the car a good detail.