I have another one if neccessary, but I think the screw shafts on it are clogged with plastic, so it might take some work as well.
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I use a heat gun to get the filament just soft enough , then use tweezers to pull off big chunks. A vice helps here, you can clamp the heat block while you're heating, then use pliers or a wrench to unscrew the heatbreak and the nozzle. Once the parts are separated, you can drop the parts in a glass jar of acetone, and that will break down the filament so you can get the rest off with a brass wire brush. Just don't dunk the thermal sensor or heater element in the acetone. The metal parts will be fine, but the insulation on the wires could be damaged depending on composition. I've saved and rebuilt several hotends this way - it's great to not have to be ordering hotend parts all the time. 😁
I don't think I have acetone, but if I try other things and they don't work then I'll try this.
It's readily available as regular old nail polish remover
What type of filament? Acetone doesn't do much to things like pla or petg, stuff that works aren't things you generally want around the house, industrial solvents and stuff. The jar of acetone can soften it up some but you'll need to soak for some time, I've used MEK too, but that's in the "don't keep that at home" category, it's really flammable and should use ppe (I mean should use ppe for a lot of the stuff we use, 99% IPA is harsh on your skin, I use nitriles because it irritates my hands something fierce.)
Cold pull as others recommended, nozzles are consumables, def should keep some around. Cleaning filament works pretty well in my experience if you have a partial clog.
I've been there though, first block I didn't use a sock and the set screws got encased in degraded petg, I ended up scrapping it and putting it on the shelf as a learning moment, def recommend a sock if you don't have, it's saved me a lot of grief.
Yep, I do have a sock, but one time the filament ended up just building up inside the sock, so it hasn't been too helpful lol
Mmmm, yeah that sucks, that first block I mentioned was an older style that wasn't fixed in place and I must have twisted it accidentally after a nozzle change, super slow leak just enveloped the thing, didn't help there either!