MICHEAL:I didnt imply anyone with a diy system is a cowboy,far from it they are sensible w/c who put themselves first.
What I was saying is that if you cannot identify spots from the 1st clean then the supplier has not explained it good enough to you,because them little white marks you are left with isnt imppacted dirt they are nothing else other than soap residue.
They will wipe off very easily with a dry scrim, but for the first couple of cleans downstairs[if done wfp] you can squeeze them and you will not have any probs.If you are worried about them you can also squeeze them by an Unger pole with a squeeze on the end a couple of downward strokes will give you a good finish.
GAZA