Let's not be too hasty about dismissing the thought of sending me and Ted to, ahem, "help out" with certain bosses. I can clean things up real nice if I want to - acid, flamethrowers, napalm, or even just a really big explosion usually erases most evidence.
You just have to remember to disable the sprinkler systems in most buildings these days and a really hot fire will do for a lot of evidence. Of course, there would be all those body parts that would need to have something done with them as there's no guarantee a fire will destroy them. But that's what a good acid bath is for. And good sulfuric acid also makes a really decent accelerant - or so I hear...
Not that I would know about any of that stuff.