Why a burnt smell coming from your toaster is not a good sign. Toasters should be regularly cleaned on the outside and old crumbs removed from the inside.
Unplug the toaster before cleaning. If there are stubborn deposits, the manufacturer Zwilling recommends using a kitchen scraper, which can also remove stubborn grease residue. Never use sharp objects such as knives or forks to clean the toasters. Other household appliances such as dishwashers can also be damaged if you make mistakes while using them.