I have several vintage ukes and I like to clean them up. I think it depends on what you want to do with your instrument. For me, I don't mind some bumps and bruises on a vintage uke, but I want to make the instrument look as good as possible. I give my vintage ukes a good cleaning when I get them, and then wipe them down from time to time. My vintage Martin uke went from looking very tired and beat up to a gleaming beauty after I cleaned and gently polished it.
If you have an instrument you want to play, I say clean it and enjoy. If you are going to sell it, often buyers prefer it untouched so they can do what they want.
Here is a link to an article on cleaning your instrument at www.frets.com
I met Frank Ford, the luthier who hosts that site and he does amazing work. For me, if Frank says it, then I trust it!
By the way, I tried the mineral oil on my Martin's fretboard in exactly the way it is described in the article and it worked very well. Got Mineral oil at Target for $1.87....it is a lifetime supply! Guess I should buy more vintage ukes to use that mineral oil on!
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