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TGR
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.