If your toaster smells burnt, cleaning the crumb tray is certainly a good countermeasure. However, even it may not catch everything that toasts, waffles, or small toaster-size meat snacks leave inside the unit. Here's what you can do about that:
- Turn the toaster upside down and carefully dump it out over a large plate or household towel.
- This way, you can effectively get most of the crumbs that have settled in various corners or even in the heating elements out of the toaster.
- Dispose of the leftovers and do the listening test: If you don't hear any rustling now, the burnt smell of the toaster should also dissipate in the future.
Fire hazard from crispbread: On a related note, please do not toast crispbread in the toaster, it is so dry that it can catch fire in the toaster after after being in the toaster for a short amount of time.