On a cold day just run each toaster through lots of cycles [ 20-50] and I suspect the burnt smell will largely go away, it is simply some bread residue burning away.

I used to have a GE-Black & Decker toaster oven with continuous cleaning finish in it and after giving the crumb tray a Good cleaning I would run it through several maximum toast cycles and then leave it on 500 F for a 1/2 hour or so to burn out any food smell and clean up the CC finish, it worked well.

John L.

As a child my parent's toaster was famous for burning toast. I don't remember the brand. We did get a more modern Sunbeam 4-slice but I recall it did the same thing. I got to the point I loved burnt toast. Just the smell of it brings back all sorts of good memories. I know...I'm weird.