Hello, It is a subject that I used to be quite passionate about. I spent years of my working life and also on our sailboat nursing the dickinson
heaters. The alcohol treatment works great. A few subtle nuances though.
What we used to do,,,,, Make sure the pot is clean of as much previous soot as possible. Turn on the carb and wait until you see the first indications of diesel
welling up in the bottom. (flashlight in hand) Turn off carb and pour in about a tablespoon of methyl hydrate (alcohol) We either filled the cap of the alcohol container or even better kept a sqeeze bottle of the starter fluid for the pupose. Light the alcohol with a bbq lighter and watch the pretty blue flame until it starts to turn yellow as the bit of diesel catchs and starts to burn. Now turn on the carb and it should be good to go. If you don't have the diesel already to go in the tube, when you first pour in the alcohol it will wash any existing soot down the tube and plug
it up. Also , you want the little bit of diesel in the bottom of the pot starting to get pre-heated. If it seems like the raw diesel is starting to get ahead of itself,ie ccoming in faster than it is burning, just turn off the carb until the flame dies down, then turn back on. If it doesn't work the first time you try it, don't repeat the process until the pot has cooled down. If you try too soon, the alcohol will give that cute little whuuuump sound and blow soot all over your interior
This sounds like complicated instructions, sorry about that, but after about 2-3 times of doing it, you will be an expert.