Restoring 100 years old house. Putting forth the effort to reuse the 'restoration glass' or 'rolled glass'. Using LCR to clean glass. Some pcs. clean up well, while other have a 'fog' or 'haze' to them. I've gone as far as to using paint thinner...with no luck. When cleaning, I clean with water, then spread LCR and let it soak while I use a razor and scrap the glass. Yet, some pcs. still have the haze. Any suggestions?