How to Clean Weathered Glass

Dampen a lint-free cleaning cloth with water. Wipe the glass with slow strokes in one direction to remove surface dirt.

Gently scrape off any rust stains or buildup with a scalpel or putty knife. Once the stain has been scraped off, remove the remaining residue with soap-embedded steel wool.

Scrub the surface of the glass with soap-embedded steel wool in a circular motion to remove lime buildup.

Create a solution of water and abrasive window-washing concentrate according to the instructions on the concentrate's bottle. Dip a plastic-bristled brush in the solution and scrub in a clockwise motion to remove paint, wax, grease, tar and smoke residue from the weathering glass. Thoroughly rinse the glass with water.

Fill a sink or basin with cool or room-temperature water. Avoid hot water as it may may crack or damage glass. Add a nickel-sized amount of dish-washing soap to every gallon of water.

Dip the glass or a portion of the glass in the soap and water solution. Dip a scouring sponge in the solution and scrub the surface of the glass in a clockwise motion.

Allow the glass to air dry.

Spray the dry glass with an ammonia-based glass cleaner. Wipe the glass clean with newspaper to avoid streaking. Ammonia cleaner helps remove hard-water buildup and mineral deposits.