Need microwave glass door replacement

This suggests you can but shows no screws or fittings
https://www.appliancefactoryparts.com/microwaves/whirlpool/mh6151xht.html

There are videos that may help

https://www.google.com/search?q=whirlpool+microwave+model+MH6151XHT-1+clean+door+glass

..

You don't

They made Microwaves in 1977? wow. I would try an appliance junkyard, or ebay. We have used a microwave safe plate of the right size and it worked well. Good luck!

You will need to remove the door and take the door apart to clean between the glass. This process is not that difficult. Just follow these steps:

1. Open the door all the way and lift straight up at the hinges to remove from oven.

2. Place the door, face down on a soft surface to protect the door and glass. A layer of towels on a countertop or table is recommended.

3. Remove the inner door panel that goes around the perimeter of the glass. The panel is pressed in place and can be removed by using a small screwdriver or putty knife and carefully insert along the seam of the inner panel. Work your way slowly around the perimeter of the glass to release the clips that hold it in place so you can pry the plastic up and pop the panel loose. Use care not to pry against the glass.

4. With the inner panel removed, the glass should be easily accessible and can be carefully lifted out and cleaned. Clean with a good non-streaking glass cleaner.

Make sure you remember how the door is assembled as you take it apart. If you forget, the following webistes have illustrated parts listings to show how your door is assembled:

searspartsdirect.com
pcappliancerepair.com
appliancepartspros.com

If you have any questions, please post back and let me know. I hope this helps you.

Got the same problem. Still inquiring but I might have found a solution here : http://midwestapplianceparts.com/microwave-parts-537/whirlpool-microwave-parts-648/microwave-door-panel-663/whirlpool-microwave-door-panel-w-glass-4212.html
$79 for the panel only

Pliglas does not inhibit microwaves. Generally, even the glass door isn't protection either. A special film, usually a polymer, is applied to the inside of the glass. The 'film' looks like a black or gray 'screen' with little holes in it.
Answer: DON'T DO IT!

I called Whirlpool Corp and told them about the problem. They are sending a factory authorized repairman immediately to repair or replace the door. Thanks to FixYa, I found a solution!

Respectfully,
Jim

Normally you have to separate the door panels (as shown in the attached photo) and then you'll see the previously hidden screws you need to remove.

Or you can watch a YouTube video (not a video I made) that demonstrates how it's done.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

you can change this part easily... if you want a fresh look, or using a degreaser that is available in home depot...
cheers

It's most likely caulk. It can usually be sliced with a razor blade.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.