I just use lemon oil. No, not the commercial furniture polishes, but just regular plain lemon oil. You can get it at essential oil places. It takes very little tho. Put a drop or two on a soft cotton cloth, and just rub it in. It will clean it (unless of course it has a bunch of crap all over it), and it conditions the wood to help prevent cracking.
Mahalo Ke Akua
Ohana SK-35 a.k.a. "IZ"
Ohana SK-21 a.k.a. "Ku'u poki'i <Kapookie>"
Lanikai LU-21 a.k.a. "Cinderella"
Epiphone Les Paul Concert Uke "Lil' Lester"
Harmony Banjo Uke a.k.a. "Bango"
Gibson Les Paul a.k.a. "Hobo Ted"
Epiphone Les Paul Studio a.k.a. "Barnabas"
Epiphone Les Paul a.k.a. "Blaze"
Gretsch Tenor Banjo a.k.a. "Jed"
Supertone 406, 5 string Banjo a.k.a. "GrandPa Jones"
Fernendes Telecaster "Suemeh"