Plastic windows

[Velvet]

Hi, new here.
My plastic windows have developed brown stains on the front ones and on the front door.
I have tried special plastic window cleaner but it doesn’t shift it. The cleaner was fine for dirt but not on these brown stains. It looks like a sand colour

 

[Crystalalan]

Hi could you show us some photos please. It might be possible to remove with a mild abrasive paste like Pink stuff.

 

[scottish cleaning service]

Could be rust stains.

 

[Harry1]

Hi, new here.
My plastic windows have developed brown stains on the front ones and on the front door.
I have tried special plastic window cleaner but it doesn’t shift it. The cleaner was fine for dirt but not on these brown stains. It looks like a sand colour

 

[Harry1]

Try upvc frame cleaner, liquid not cream

 

[Velvet]

Thank you for your reply. I enclose photos of my window sill and the products I have used.

 

[kevinc250]

hi @Velvet what you have their is shiplap underneath the window or windows thats degraded with age, its a very simple job to remove and replace with new shiplap, due to its purpose its not really made from the best quality materials and has a 15 year colour warrenty, nothing on earth is going to bring that back up,and if it does its going to come back soon, just replace it as its so cheap to do yourself
hope this helps