Boil a cup of water in the microwave, let it sit and steam for a couple of minutes to soften splatters, then wipe with a damp cloth. Might take a few times, but should work.
Kathy G in MI

Thanks for your suggestion. Actually I have tried this, but still need to scrub hard to get the ss clean. I usually avoid using this oven for potentially messy cooking which is a shame because it does a great job using alot less energy than the big oven. Any other suggestions would greatly be appreciated. If you've used oven cleaner please comment on this.

I would check with the manufacturer before using oven cleaner. My gut feeling is that oven cleaner is too caustic for stainless steel.

Help, still haven't found a solution yet, thanks for the tip about oven cleaner

What about Barkeeper's Friend on a sponge after softening the baked-on stuff again with water/steam?

yes, looks like It's going to be back to the brillo, but even that doesn't get everything off and requires alot of elbow grease. Thanks.

Magic Eraser after a steam clean as Kathy suggested. Also, Spray 9 works well to cut grease, but it does not have a pleasant odor, so cook something with cinnamon after you use it.
Also, get a cheapie plastic cover that you can put on top of your food. This will minimize the splattering.

How about some vinegar in that water you boil in the microwave?
I also wonder about ammonia in the boiling water? No idea if it would damage the surface....but I would rather damage than dirty!
Linda c

I have the same interior in my convection/microwave and have been frustrated as well. After reading these posts, I first boiled vinegar/water in the micro, then used Bon Ami on a rag dipped in the boiling vinegar water and to my amazement, it actually came pretty clean for the first time in 3 years!

Rock Oil Grill & BBQ cleaner sold only by Home Depot. I had heard it is a proprietary brand. Found in the cleaning supplies isle.

I have tried non abrasive things for baked on grease. Vinegar, baking soda and the like. Only had success with Brillo pads, rinse water and TONS of elbow grease!

Oh no ! I just bought the same type of convection/microwave and having the same issue with cleaning ! :(

Steel Power from Hillmark is a liquid, heavy duty, non abrasive cleaner. I put some on a non-scrath kitchen spunge and apply a bit of ‘elbow grease’ - it works wonders! It is an Australian product

First - prevention- yrs ago in a class (yes they had them in the 80s) on how to use a microwave oven my teacher taught us to cover what you are cooking with a loose sheet of wax paper - this really helps! I understand you can use foil on the convention only setting - but I haven't tried it.

Second - a micro-convection oven is a different animal and Whirlpool instructions are pathetic! The inside is only metal around the fan - the rest is some plastic/synthetic product.

A. Try not to let this project get too far ahead of you - the longer you wait the more the gunk gets baked on and is harder to remove.

B. Take out all the removal parts - turntable, shelves, etc. They can be easily washed in the sink.

C. Put a bowl of water with vinegar or lemon juice in for a couple of minutes to steam the interior. Then while the oven is still warm use a sponge with a scrubby back to wipe down and use some elbow grease on gunk.

D. Burnt on grease around the metal fan - Once I have cleaned as much as possible with dishsoap and scrubby, I use a Magic Eraser - these will get it clean but not like new. Be careful to get the fan openings clear - if magic eraser gets stuck on them - use a clean sponge with water to wipe them.

Please let me know if this helps anyone.

You really have to use a cover.

Steel Power from Hillmark is a liquid, heavy duty, non abrasive cleaner, does anyone know where I can purchase this product in the US?