[KarlJones]

Now I would not normally suggest this for window cleaning, but vinegar.

Have you tried it?  It is good at removing limescale so it might stand a chance.

[DASERVICES]

I have loads of houses like this , one house you cannot see out of the windows because it is that bad. But these were like that when I use to trad clean them.
The route cause is bad building deisgn, even on new houses this is happening.

On one brand new building which has no top windows I pointed it out to the owner. In Scotland it is pretty bad as each house is rendered and then stone chippings so the water running down the walls gets contaminated by the glue they use to adhere the stones. This then runs onto the windows and marks them.

WFP is not the root cause as when you do the bottom windows you will have washed the residue that has run from the upstairs windows. It's the rain and I do not know what builders are using now but nearly every new house will have these problems.

Maybe worth looking into and speaking to someone in the building trade.

Doug

[eddie d]

id say ladder it or drop it .the pole doesnt work everywhere.

[cleantech.co.uk]

mathew, have you tried using MDR on the windows?

http://www.cleantech.co.uk/catalog/product_info.php?cPath=21_34&products_id=177

it should remove the spots.

basically the trouble is that the builing itself may be dirty, so when the water rinses down its cleaning the building, transfering the dirt from it to the downstairs windows.

the problem will EVENTUALLY go away, but you could try and suggest to them that the have the building pressure washed - this should help.

p.s. - is it a sandstone, brick or painted building ?