What are these stains???

What are these stains and how dose one get rid of them, used some Screwfix degreaser at a 10:1 ratio, sprayed, agitated, let soak for a minute or so then scrubbed again with the sill brush, lightened them slightly but didn't get rid of them at all? 

I know it's probably on here all the time but I need your expert advice. I'm guessing it's an Unger rub out kinda job? 

Thanks 

Spider poop! If you see this on a frame and look directly above it there is usually a spider nest in the edge of the frame.

It's hard to remove fully but for me it is easy enough to remove 90% of it just with normal brushing with pure.

Maybe it's been left on for a while and stained?

Magic sponge should shift it. Unger rub out will definitely shift it.

Skxawng said:

Spider poop! If you see this on a frame and look directly above it there is usually a spider nest in the edge of the frame.

It's hard to remove fully but for me it is easy enough to remove 90% of it just with normal brushing with pure.

Maybe it's been left on for a while and stained?

Magic sponge should shift it. Unger rub out will definitely shift it.

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Spider poop, really... Huh, didn't know that, thanks. The windows were terrible for spiders and webs, never seen a house as bad as it so would explain the spider poop... A lot of effort getting the Unger rub out for a regular window clean, I use pure with the wfp and sill brush but I may get some magic sponges and try that with the pure and degreaser. 

Rinse scrub do the windows


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Bit of elbow grease normal brings it out


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Soak with pure, wash window, then scrub again, miggt need a cloth to speed cleaning, if on lower window i give them a scrub with the gardeners scraper white pad( i take it of scraper n use by hand)  if it leaves sny staining after that. Then thats that. Sun might bleach it out by the next time.