Generally, black soot stains mean the gas/air mix has too little air. If you have an adjustment for the air mix, open it up a bit. Also (don't laugh)- small spiders love to build cocoons inside these gas/air tubes. That really messes up your flame!
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You can remove it by using baking soda, or use the stain remover available in household hardware shop. There instruction in the box so just follow it. Also when mineral residue is remove. Use a fitered water for boiling the water, filtered water doesn't stain must compare to tap water. I hope I help you solve your problem.
Does it appear that the enamel is worn away and the stain is embedded into the underlying ceramic?
If not, here's a crazy thought for a solution that just might work: Oxiclean. It's safe to put in your dishwasher, and it certainly does a stellar job of getting stains out of practically anything. It works best in warm to hot (but not boiling water), so a scoop in a crock pot full of water set to low for an hour or two may just do the trick. If not, I doubt anything will. Be sure to rinse it thoroughly after cleaning. If you've used Oxiclean before, you know how slick the residue can be.
Your water may have copper in it (or the heating element). When you boil the water you are left with the residue just like you are left with the lime scale. Vinegar should be able to remove both types of stains.
I would clean the carbs. I would bet that they are fouling out because your idle jet is plugged and that is causing the illusion of too much oil. If you clean out the idle jets then you should be able to run fine. You can also run the RPM's up pretty high and choke the engine out. Hold the choke until the engine is about to die and then release the choke. That causes a vaccum in the carb and can possibly **** the stuff out of your idle jet.
Will the flame go out if you turn the control knob to the off position?
Sometimes gas cooking control knobs have two seperate types of control in the one knob. One control turn the gas on or off, one adjusts the variable quantity of gas allowed through a gap to your flame jets. Some control knobs can get gummed up and stick a little. The can be fixed by carefully taking apart the control knob, taking note of EXACTLY how everything goes back together and cleaning any gummed up bits. Then reassemble the knob and drizzle soapy water over the control to test for leaks. A leaky gas join blows bubbles and makes noise. Let me know if this fixes the problem.
Straight from the company:
All Paragon poppers utilize tempered glass panels, stainless steel cleanout trays, aluminum corner posts and either plated or anodized kettles. These surfaces can be cleaned using standard window cleaner. You will want to note that you should never submerge a kettle in any type of liquid because it has electrical components inside of it that can short out. Paragon kettles are designed to be wiped out with a clean cloth after each use. Should you have a kettle that gets burned on oil stains you can order Paragon's kettle cleaning kit (part# 1075) which will allow you to clean it to near new conditions. We also feature Carbon Off kettle cleaner. Winner of many gold medals for being the best product on the market. http://www.paragonpopcornmachines.com/