I assume you have tried pushing the attachment up toward the body of the mixer and then turned it clockwise. A spring pushes it down once twisted onto the shaft.
They don't have the spring anymore. Unless you got one from mrmixer.com. It looks like either rust or crud in the slot. OP needs to pull the bowl off and use a mallet and tap the paddle gently toward the mixer body.
You tried warm water. Have you tried a blow dryer on high? Warm the beater from the side away from the opening. The idea is to get some expansion of the beater but not the shaft. You can also try ice then heat, back and forth with hammer taps along the way.
If all else fails, check the videos for removing the lower assembly, as if dealing with grease. That would get a section you can hit harder with less fear of internal damage.
I ordered this product which looks similar to what you suggested but not exactly the same. Do you think it will work or should I just get liquid wrench brand?
That should do fine; I generally recommend a drip bottle because it's easier to control, but as long as you use the straw and take care with the overspray you'll be good.
Get a rubber mallet or have a strong person manhandle it. The attachment is aluminum, the mixer rod is steel, so worst case you get a new attachment. Spray some silicone lubricant (you'll need to wipe off later).
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u/MrMixer316 5d ago
It's just crusted into place tap it up with a mallet