qd is basically pang linis and shine, minsan lube for claying. can do lite to medium dirt and kahit some heavy pero in case of the latter 2, you have to think of the cost and effort versus carwash. so for me spot med/heavy dirts lang ginamitan ko nito like epot ng ibon. BTW dont take my word na qd talaga yang sliq because im not so sure myself dahil medyo iba nga sinasabi ng product info niya (step 4) pero based sa experience it can do the function ng qd so i use this as cheaper alternate for mothers showtime which is specifically labeled as a detailer