The microwave can only fit upto eight jars. Even so, when doing a large quantity of jars, it can beat a conventional oven for speed. This is because of the microwave’s fast turn around.
Clean and rinse jars.
Then leave to drain.
Place in the microwave right side up, and heat for 5 minutes.
Remove from the oven and leave the jars on the cooling rack for 5 minutes.
Next, screw on clean, dry lids.