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Sounds like the motor still moves things a bit, but you're wisely opting to not burn it out. :-)
Before you go that far, there are some intermediate things to consider. First of all, don't do anything with the blender plugged in! It can mess up fingers big time. No cutting corners here!
If the debris is external, soak it in soap and hot water, blade down, for a while, and remove what you can with a soft brush or washcloth, being careful with fingers around the blade. If the blade moves at all, grab, preferably with gloved fingers, or with a pair of pliers, and rotate the blade back and forth. If it goes a little bit and stops, don't force it, just go back the other direction as far as you can go. Hopefully after a few runs through the range of motion, it'll start moving further, and you can loosen it. Feel whether it seems to have friction, some specific spot where it binds, whether the resistance feels friction-y, or gummy. Be patient and see if working it by hand, maybe with help from a tool for grip, will loosen it up.
Also check the cord. If it's been wrapped around and around the blender for storage (no, I've NEVER done that, nope nope), over time it'll tend to get really twisty and prone to tangling on itself. it may also then get partially broken, particularly at the spot where the cord enters the body of the blender. You can carefully try wiggling sections of the cord while it's running. If things suddenly change RPMs a lot, then the cord needs to be replaced (which will lead you back to disassembly)
Trying to lube it is dodgy. This will be going into your food and drinks, and you really don't want it slowly depositing 3-in-1 oil or WD-40 back into your smoothies for the next month. If it comes to that, you'll need to take your original aim and try to disassemble it. Then you can make sure that any lube is only where it belongs.
Just fixed my blender. Motor was working fine, but the bladea wouldn't turn. I removed the blade piece from the base and tried moving the blades by hand and they wouldn't turn. So, I lubricated the blade at the location where it's supposed to rotate. I kept trying to move the blades by hand and gradually they started to loosen up. All fixed!!! I guess they get stuck after a few years of use.
Check the blade with it off the base and make sure that it spins freely. Check the spindle on the base and see if it feels hard to turn. If the spindle turns too easy , then the connection inside the base is broken and needs replacing.
Replace the blade assembly immediately. They are available from Cuisinart's website. Sugars and other stuff can gum up the blade assembly over time, so it will periodically need to be replaced. A quick and easy way to keep the blade assembly clean and working longer is to put water and a drop of dishwashing soap in the blender after use and run the blender at low speed for 15-20 seconds - an old Osterizer trick.
Frozen elements are generally not recommended for blenders of any brand. They may cause the blade assembly to stop moving completely, or to "bog down," and this may eventually damage the motor. It is recommended that frozen fruits and/or yogurt be thawed when possible before placing into a blender. If this is not a possibility for you, I would use a "pulse" or "chop ice" function to rapidly spin the blades for just a moment. This will chop the contents in smaller, more manageable parts. This should be done before adding other liquid ingredients.
Apply vinegar to a rag and a couple of q-tips - use the rag for any exposed areas, and use the q-tips to let vinegar drop into the hard-to-reach areas. You tried everything else I would have suggested.
If the problem is that the blades are jammed and you can't turn them manually, you can let it sit ( and dry out ) for a few days, or you can try adding some oil. I had the same problem and this worked. My problem now is that the blades don't reach to where the motor is turning, so even if they're not jammed the don't turn. If anyone knows and answer to this I'd appreciate it.