I used a combination of compressed air and a brush made from horse hair, you can use specific brushes made for electronics but I prefer softer brushes that are made from horse hair. If you do take it apart to clean then make sure you try not to flex the Naomi motherboard too much as they are notorious for developing glitches after the solder has cracked underneath the chips.
Hmm, I really should update this thread....
The once glitchy N2 has been fine for 2 1/2 years! I've still got a spare that I bought off the Geezer.
Another thing, although I had a few problems in the beginning this cab has been 100% reliable since sorting everything out, basically stuff that just wears out with it being turned on all the time on site. I now know this cab was in pretty good shape to begin with as I've bought some pretty dire cabs over the years.
Since the last update I've fitted a new PFX screen, bought an OR2SP kit, retro fitted an ID1 view panel/coin tower w/card reader, fitted some nos parts, fitted an official Sega CF kit and also fitted a bass transducer from a D2 deluxe into the seatback. I still haven't had the opportunity to get the metalwork powdercoated though, when OCD kicks in the I'll no doubt get that sorted.
Still looking for the LH side panel art and Jp/USA topper as well, it seems like it's a never ending mission!
All in all this is still my favourite cab out of all my cabs, I've spent quite a bit on this cab but it still looks a bit scruffy due to the rusty/flaking paintwork. Sometime in the future I'll try and do an update to show the cab as it is.
Here's a placeholder pic until I get around to doing an update: