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Hello Hymie,Done it more than once, I have always very carefully levered them out until I can get a razor blade in behind them to cut the adhesive away. Work from the inside and keep a firm pressure on the window frame to make the cutting easier. The adhesive will clean up easily enough, pick enough off to make a ball about 5 - 10mm in dia and the press it hard into the residue you want to remove and pull it away. Eventually it will lift the bulk of it away and any remaining can be dissolved with mineral turps.