I don't know about a low setting, my soldering gun doesn't have a variable heat setting, but yea that might be the way to go, their so much PLA coating the block I can't remove screw holding the heater cartridge. once I get it out then I'll soak it in some paint thinner / turpentine to clean of the block and nozzle. I'm not keen on soaking it in a flammable liquid with the heater cartridge still in it as I have a fear the wire coating will absorb it and then (I'm sure I'm probably wrong through) down the road when I decide the put it on the system it burst into flames when I try a print.