I have become an absolute expert in rebuilding small engine carburetors - 2 and 4 cycle. I hate that nasty crap. I use a healthy does of Sea Foam to run out the last tank of gas before winter.
In small engines I only use ethanol free marine gas I treat with STA-BIL.
Here’s a finder for such gas;
I use the ‘red’ STA-BIL in all my gas and never have a problem now. No more plugged carbs or fouled plugs.
The ethanol mandate has created a new industry of non ethanol fuels. True Fuel, Stihl and even Home Depot have their own versions of premixed and straight gasoline they sell in 1 quart containers for $6 or more retail.
I actually buy leaded 109 octane racing fuel by the gallon for about $9.00/gallon. It is the only alternative I can find here in NH that is within a ten mile drive. There are no other gas stations that sell non ethanol fuel around here.
For storage over the winter I put True Fuel into my multiple small engine equipment. I run them down to nothing, put just a little bit into their fuel tank. Then I restart and let them run for a few minutes to circulate the True Fuel and then shut it off. I have gone to this method after replacing two carbs.
We used methanol in karts I used to race. After every race day was done, we'd drain the fuel tank, and then pull the fuel hose from the tank end, and fill it up with WD-40, start the engine, and run the WD-40 through the engine. Never had problems. The WD-40 lubed things up and removed any moisture from the alcohol, and also removed all vestiges of alcohol from the fuel system.
One time I failed to do it at the end of the day, the kart sat for a week, and when I pulled it apart, there was rust forming on the steel parts, and the carb was gunked with the salts left over from the alcohol evaporation.