I soak them in tap water. Throw some soap or cleaning agent if you want. After that I take them out and wipe each keycap down with a small towel. Before I put them back I just run over the bare kb with a vaccum while using a small brush to get most of the dust off. Been cleaning it this way for...
They're a waste of money from the bad experiences I had with those.I'd rather get a pure HDD or SSD and not some messed up lovechild. The extra cost isn't justifiable IMO.