Be kind to your microwave and you can expect approximately 10 years out of it! While Microwaves do have a longer life span, the BEST way to achieve top performance is to keep your machine clean!
Particles left behind from splattering turn into Carbon and in turn causes damage due to the electrical sparking.
The best way to clean: Heat up a microwave-safe glass of water until the liquid boils. The steam will loosen any stuck-on gunk inside. Then, you can easily remove it all with dishwashing soap and water.