How do you remove fog from old glass

Hi Ruth, (again! LoL)

Clean Hazy Glass in Place

1. Step 1 Rinse with Soap & Water. Rinse the glass with simple dish soap and water first. ...
2. Step 2 Razor Blade the Glass. Grab a flat razor blade or better yet a glass razor scraper and scrape across the surface of the glass. ...
3. Step 3 Wipe Clean. ...

Step 4 Polish Glass.

You could try this site for ideas, https://thecraftsmanblog.com/how-to-clean-hazy-glass/

if product or paint is on the glass the flat razor is the way to go. You may also try baking soda or toothpaste to try to polish it also. If all else fails, depending on how big the glass panel is, try some clear silicone spray on it.

Sometimes, fog or haze is due to hard water deposits. White vinegar will remove the fog if this is the case. Also, if the fog is inside a glass vase or bottle, add a tablespoon of rice aNd straight white vinegar. Shake or swirl vigorously. Rinse well!

You might try using a little gasoline on a soft cloth running gently.

If you can put it in the sink, put a towel along the bottom of the sink. Use warm water with a little bit of soap (I like dawn, it helps with built up grease and dust). Carefully wash with soft rags and rinse well. I let them air dry, but you can dry them if you want.