TGR-
I doubt it but I cannot say I remember having done it as I don't deal with upvc much. I guess that's partly because I renovate sash windows!
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CT1. multi solve
Any idea if that would cause any damage to pvc windows when removing silicon?
Wbite pvc frames seem to be OK, but I'd be cautious with foil coated (wood effect) or coloured frames.
I got a can of it a year ago, but only used it once. I think softened silicone, still stuck in the grain of the mortar is worse than a thin layer of well adhered old stuff.
A couple of scrapers, one very sharp and burr free for using on the frame, followed by a scrub with a MF cloth and pvc cleaner seems to work well.
The other scraper gets abused for against the stone work and gets a resharpen with 240grit wet n dry when needed. -
From a service engineer of my pvc windows I got the tip to use Makrysol spray for removing sticky tape residu. They use it on foil coated windows as well
https://www.makra.de/makraportal/ProduktDetail.aspx?group=005.04&ID=302-11/SRinse the windows properly after using this stuff.
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Airhead
user69121
Wouter
Look at CT1. They also have a product called multi solve that will clean the rest of that mastic off. It looks like it was fixed with a normal bathroom sealant when it needed something that would both seal and handle the weight.
CT1 gets used and abused in a lot of situations so I would take the reviews with a pinch of salt. The multi solve is very useful when you're cleaning old mastic residue off baths.