Hi, red pad is maximum alowed but you can try first with white pad even if it's mostly usef for buffing/polishing. I tend to rely more on the chemical side rather than using agresive pads or brushes.
I always try 1-2 mp and move to more agresive methods only if needed. Neutral F. Cleaner from chemspec still surprise me, it works well on so many surfaces even if it is advertised for resilient floors. Just remember that dwelling time is very important. But there are more experienced guys here who can point you in the best direction.