This advice may help:
Step 1: Make sure to clean out the microwave dish and microwave itself carefully
Step 2: Spray the whole of your apartment/house to get rid of the smells
Step 3: Use a sponge with some scented dishwashing liquid to scrub off the smell in the interior of the microwave
Step 4: Don't make it seem obvious to your parents about your experiment
I hope it helped.