I use the Lee 10 lb bottom pour pot and will give some opinions of how to avoid trouble with using.I never put wheel weights directly into the pot as the dirt and sand on them will cause problems with the pour spout.I have a larger cast iron pot that I melt the wheel weights in and clean them up and pour billets small enough to fit in the Lee pot.I never empty the clean up pot as there may be junk in the bottom that will effect the Lee's spout.Keep a screwdriver laying close to the Lee pot to give the a few twist if it starts to drip.Have never had to use anything to clean the spout.
Jake