+1 for Music Nomad Guitar Detailer, which is specifically designed for matte finishes, open pore finishes, and ukuleles.
Many other cleaning products, including Music Nomad's "One" cleaner, contain wax, which isn't good for your matte finish. It will build up, and aside from the shine, it can negatively affect the sound.
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"It's only castles burning." - Neil Young
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