Up to 80% of faults in microwave ovens associated with splashes of prepared products on the waveguide cover (the material of which it is made – mica microwave), which begins on the arcing between the antenna of the magnetron and a protective cover. Delays in addressing the causes can lead to local burn-magnetron antenna until its complete destruction holes more than 30% of the antenna, breach of painting the chamber and its rusting. To fix the problem in this case requires replacement magnetron waveguide cover and camera cleaning detergents.