Questions about an oil painting
About 25 years ago I received an oil painting as a gift. This was done by a non professional, but is very beautiful.
I'm trying to downsize a bit and I gave this to my daughter. She noticed that there are a few spots on it, and it appears to have picked up some yellowish color, probably from second hand smoke. We don't know if there is any special coating over the oil paint but am wondeing if there is any way that she can safely clean this off and brighten it up a bit. It is a lovely painting and she does really want to try. She read that a solution af lemon juice and water might work but is leery of trying that. Do any of you have any sugestions or advice?
Thanks in advance.