if it is not stuck to the glass; I use Wonder bread and blot it. Any pasty white bread works. To remove it from the glass takes a sharp razor and a skilled hand

NO DO NOT WET THE BREAD. It is moist enough

Hi, is it a print or a painting since you’ve mentioned its’ age?

If by chance it is a “painting”, I clean my paintings with a slightly wet cloth and some mild soap. It takes longer to dry but once dry, the painting will last clean forever.

Would love to see a photo image of it if you can manage to add it on here next?

Hey Penny – I’m not sure about wetting the bread. I’ve used bread for similar cleanings, but I’ve never wet it. Something in the bread helps draw greasy/moldy dirt into it, sort of like a magnetic duster. Good luck!

I would find out if I had an expert in cleaning antique and or vintage fabrics in my town and take it to them. Nearly every city has someone who offers this service. Think of the passed down thru the family wedding dress that needs to be cleaned. If one isn’t sure what a stain is they can make matters worse, I have been told.

You can contact your local museum and ask them who they use for art conserving or cleaning or a well-known auction house. If you have an expensive print you don’t want to be messing around if you don’t know what you’re doing.

Never heard of using Wonder bread but will try it. I guess I wet the bread?

Do not wet your bread.

Dry is only way to go, and it’s worth a try before you invest in professional services.

Do not use any kind of liquid if it is a lithograph, or printed material, instead, use a very soft paintbrush to lightly brush the mold off of it. Clean the inside of the glass as you normally would, and make sure the glass is completely dry before placing the image back.