Hello, I was wondering if any of you have examples of what Virtuoso Cleaner does to a white guitar that has turned to an extremely dark yellow due largely to cigarette smoke exposure. It's so dark that I would call it tan more than yellow. The finish is nitro clear coats over neutral white acrylic color coat, and it's 39 years old. I don't need to get it back to neutral white, but it would be nice if it wasn't so dark, and I could get at least 1/2 of the smell out. As an initial trial, I wiped the guitar down with dish soap and cold water, using a microfiber cloth. To my surprise, it actually did pull a tiny bit of smoke off. Not a lot, but some. But for all I know, the lightening could have just been old clear coat getting abraded off by the rubbing, not smoke residue being pulled off of the finish. If no product can give me an even lightening of the smoke damage, I will just leave it as is. It's actually a pretty nice color in and of itself, but there was a sticker on the finish for a long time, and the area underneath it did not get affected by the cigarette smoke. That's the part that bothers me more than anything else. Thank you.