My propane lantern kept getting dimmer and dimmer. Not only that but it was blowing black smoke and the globe was getting covered with soot from a bad air – gas mixture. 

I disassembled the lantern a few weeks ago and removed a tablespoon of mud and oily residue from the air intake which is hidden under the plastic cover near the brightness control knob. Propane in cold weather can get very oily and it attracts mud like a giant magnet. This is particularly true when your using it at temperatures below freezing with long hoses from a 20 lb tank. 

Now it’s super bright like new again.