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I believe the reason this glass cleaner works it because wood ashes and water make lye, a strong alkali. Coal ashes do not appear to make lye, so forgive my suggestion. A better option is to save campfire ashes or a neighbor's wood ashes in a pail for later use. Hardwood might make a stronger alkali.
Have you tried this method? It works for a variety of woods and hardwoods, and for haze to dark pitch resin. Try using this method in combination with a razor blade scraper. Use a new razor blade because burrs or even corners of the blade can scratch glass. I don't know about scratching tempered glass, but razor blades can definitely scratch window glass; it's a rookie house painter mistake.
Hahaha, err, Voila! So much for adding string theory to a cleaning Instructables.
Fast FREE Effective Wood St...View Instructable »
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