I was thinking of the spongy granules, that could be fitted to (filled-into) a filter of sorts on the CPU exhaust.
Obviously using a liquid based 'neutraliser' would be a bad idea ... as for the Febreeze smell, I've found it disappears after a good airing anyway, in the case of my tent, it still smell mouldy, but less so now. I wouldn't use it on anything thats not fabric.