Microwave making funny noise

[Keitai]

This microwave keeps making a spark noise. Has it had it?

How do you clean the hole at back of the fridge? Think it drains liquid into a tray.

I gotta get a charity to take it away

 

[Harry Bloomfield]

The sparking in the microwave may be the little white coloured window which covers the wave guide exit. You can buy them for a pound or two, then cut to size with scissors.

Thin stiff wire poked down the drain hole in the fridge, will clear it of debris..

 

[foxhole]

The mica mat may have broken down , got mine here and cut to match existing .
https://www.ebay.co.uk/p/Microwave-...MIpZa2lpH05AIVCLLtCh2XYgB4EAQYBCABEgJsuPD_BwE

 

[Harry Bloomfield]

The mica mat may have broken down , got mine here and cut to match existing .

Mica - that's the word I was looking for, thanks. It just needs a splash of food on it, to cause it to burn and spark.