good luck daz.
I had same problems when i started.
doing downstairs trad is good idea and is what i did.
as you get more experienced, then do whole house wfp.
On my last clean trad i cleaned top frame to help avoid run marks.
I have read your previous posts and i know your very cautious as i am.
And it is disheartening when you feel that you have done absoutlety everything you can; and you still get spots.
Even now on some clean i notice some slight spotting.
I think it was pingu who said "wfp, is good enough for my customers, but not good enough for me"
I can't remember the last time i had a complaint due to spotting (shouldn't of said that
)
People will except it, if someone complains don't admit that your having a lot of probs, or offer to go back to ladders.
as mb said your starting over; but after 3 cleans you will get quicker and earn more.
All the best to you daz; hang in there