Because sometimes Nature really does have the answer, heh. Lipase, amylase, and protease can cut through plant-oil residues very quickly without damaging paint, gypsum board, or any other building materials. Plus, laying it down with a foaming sprayer will keep the enzyme in contact with the surface and really lower the scrubbing time. You can even get those aggravating mini-blinds clean with little to no effort just by soaking them in a hot enzyme "bath" for an hour or so, then rinsing. If I'm going after a soot-dense dry fire like electrical, I'm not going to bother with enzymes because there's nothing there for them to break down. But when there's an oil or grease element, like tobacco or cooking fires, enzymes can help break down those oils and make the job go faster. Plus, they're so much nicer to work with than ammonia...!