Megs 3 step is ok. Step 1 is not a bad paint cleaner, step 2 is more of glaze than say srp, I would though replace step 3 with something like NXT 2.0 (if you want to stay with megs)about £15 or for a bit more money a good paste wax like Chemical Guys 50:50, Dodo Juice or Race Glaze 42 all around the £40 mark.
Any of these will outlast megs step 3. by a country mile.