Scrape silicone caulk off the surface of your new glass windows using a razor-edged glass scraper.
Remove any soft, uncured silicone residue with rubbing alcohol poured onto a cloth. Gently rub the uncured silicone residue with the alcohol to break down the stickiness and remove it from the surface.
Treat hardened, cured silicone caulk residue by wiping it with a cloth dampened with mineral spirits. Repeatedly wipe the window to remove the caulk residue from the surface. As the residue softens, scrape it off with the razor-edged glass scraper.
Add a drop of dishwashing detergent to a damp nonabrasive scrubber. Scrub the surface of your new glass window to remove any last trace of silicone residue.
Rinse the window surface by wiping it off with a damp cloth. Dry the glass with another cloth.
Spritz the new window glass with glass cleaner. Wipe to remove detergent residue and any other cleaning agents.