GB are you absolutely sure these spots were not there before you wfp'd them?
Glass can very often look "spotty" when viewed at the right angle & reflecting from the sky. Often, if you look at the same glass face on, you do not see any "spots" whatsoever!
These marks are "on" the glass & can be either old, natural mineral stains or imperfections in the surface. I've come across this many times, I do a hotel with very large windows & they are the same. When looked at from "the" angle they look quite a mess to be honest. However, they are perfectly clean & when looked through at eye level are crystal clear with no marks/spotting etc. When this is the case, you will find that nothing will shift these marks, which doesn't really matter anyway, it's not your cleaning that's at fault but just the nature of the glass.
Next time this happens GB, get up your ladder & see if these here spots are visible or not when viewed face on.
thanks mate. reading your reply as sort of shifted my opinion about things alittle! thanks so much
now, to answer your question. I cant be positive that the spots wernt there before i wfp them.
its really really good to hear im not the only one to see these faint spots
but i do think my technique was a little rushed before i changed my ways
lack of rinsing probably being my biggest fualt, i dunno.
and yes i'll do as you say and get my ladder out and see whats what with the spots, ive already been around my whole round (nearly) and made a note of spotted windows, so next time i clean these windows i will trad them and possibly do some hard water removal if necessary.
ive got some MDR if there really bad, if not i'll first try normal trad then move on to cillit bang lime and grime (as suggested from someone on this forum) then as a last resort MDR and a scraper blade!
thanks mate, youve made a sad man happy today!!!
GB