Cleaning old ukes?

Well, my 80 year old George La Foley has arrived and it plays as sweet as a little nut. However, I want to lift the age old dirt off it (although the purists may say it's part of its heritage). It was a little sticky so I gently wiped it with tepid water and Vanish soap which has made it more pleasant to play. Judging by the coloured strings and the chord positions marked with bits of paper, it might have been jazzed up for a child. That could explain the tacky feel it had.

So, can anyone advise me on how to go about cleaning it? Also, I thought these ukes were mahogany, but this is the wrong colour. If it's been stained, then it was done well. Any thoughts? Many thanks.

Looks like my computer skills failed me again. Here's another go at the picture:

And another question! What sort of strings would suit this old lady? I have a set of D'Addario and a set of Daniel Mari strings hanging around. I like Aquilas, so maybe I should stick to those. Hey ho ... Has anyone any experience of ancient UK ukes?

hmm strings.. i don`t know much about this but I do know that old uke's are normally built for low tension strings, high tension might damage it in some way.