I looked into this recently - microwave ovens emit an electromagnetic frequency due to the power coursing through them that’s very useful for tracking time, so that is why they usually have clocks. The problem is, the frequency is dependent on the power it receives, and mains voltage fluctuates. For example, those in a UK household may have heard that mains voltage is 240V. In reality this is 230-250V (reference below). The clock running a slight bit faster indicates a higher trending voltage than the microwave was rated for.

• My microwave is rated for 230-240V and has a frequency of 2450MHz.

Cleaner

Windows? I was crazy once.

One is more 1950s Mr Clean and the other is 2010s Mr Clean