You can put the entire board in the dishwasher, that's a common way to clean particularly dirty boards - you just run it without detergent and stop the cycle before the drying cycle (which just heats up like an oven to dry everything)
I don't know if I'd do it with a NAOMI though, too fragile
I also put the cartridge Naomi just the housings no problem
The sticker does not move
But be careful not to wipe THE BARCODE right away because I saw that on my motherboards the ink had drooled a little
And that the little STICKERS OF SERIALS disappear a little :/