Don’t worry buddy I will help you here to get the tips about to maintain Microwave Oven so that you can have idea about it.

Here I have some tips

Clean the interior of the oven chamber after use with a damp cloth and some detergent if necessary.

Built up food deposits can eventually carbonize resulting in sparks, arcs, heating, and damage to the mica waveguide cover and interior paint - as well as potentially more serious damage to the magnetron.

If there is any chance of food deposits having made their way above the waveguide cover in the roof of the chamber, remove the waveguide cover and thoroughly clean inside the waveguide as well.

Clean the exterior of the cabinet and touchpad in a similar manner.

DO NOT use a spray where any can find its way inside through the door latch or ventilation holes, or a dripping wet cloth.

Be especially careful around the area of the touchpad since liquid can seep underneath resulting in unresponsive or stuck buttons or erratic operation.

Do not use strong solvents (though a bit of isopropyl alcohol is fine if needed to remove sticky residue from unwanted labels, for example).

Check the cord and plug for physical damage and to make sure the plug is secure and tight in the outlet

Heat, especially from a combination microwave/convection oven or from other heat producing appliances can damage the plug and/or cord.

If there is evidence of overheating at the outlet itself, the outlet (and possibly the plug as well) should be replaced.

Weekly check you Oven for dust and dirt around the ventilation holes or grills.

Clean them up and use a vacuum cleaner to suck up loose dust.

Keeping the ventilation free will minimize the chance of overheating.

Listen for any unusual sounds coming from inside the oven.

While these appliances are not exactly quiet, grinding, squealing, scraping, or other noises - especially if they were not there when the oven was new - may indicate the need for some more extensive maintenance like belt replacement or motor lubrication.

Attending to these minor problems now may prevent major repairs in the future.

Keep your kitchen clean.