I Need some help identifying and removing an electrical outlet cover in the kitchen.
I removed the middle screw but the cover is still not coming off, no screws on the sides either.
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I would shut off the circuit, then test the sockets are all dead (test all, I'm paranoid.)
Then get cleaning with degreaser and warm water.
The upper slope especially looks like it has caked-on grease and oils from cooking, which will have wicked inside the fitting and "glued" the whole thing together.
It might help to use warm air from a hairdryer to soften the congealed grease too.
If you look at the back of this guy there are two 3-prong plugs, spaced to plug into the two outlets in a standard duplex outlet. They are installed by removing the cover plate, plugging in the extender, then inserting the center screw and screwing it into the existing outlet's cover plate screw hole.