Acrylic/latex (water-based) caulk
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Dampen a sponge with water and wet the caulk that you want to remove from the glass.
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Take your razor blade (or glass scraper or putty knife) and, keeping it as level with the glass as possible, scrape the caulk from underneath and push towards the window frame (or towards the edge of the glass) in short, even strokes. Be sure to keep your caulk damp as you continue to scrape.
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Wipe up the remaining caulk residue with a cloth or cotton ball soaked in rubbing alcohol.
Silicone caulk
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Heat up a small area of the silicone caulk you want to remove with a hair dryer.
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Scrape the silicone caulk from underneath with your razor blade (or glass scraper or putty knife), keeping the blade as level with the glass as possible. Continue to heat up your caulk sections as you scrape with your razor blade.
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Cut small sections with your razor blade if you are attempting to remove long strips to make it easier to peel the caulk off the glass once it is heated and scraped up.
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Wipe up any silicone caulk remnants from the glass with a cloth or cotton ball soaked with rubbing alcohol.
