It is bad out there. Some places really bad. Around here, more and more small equipment and powersport shops sell "pure" fuel because of the issue. Most quality 2T mix also contain fuel stabilizers. If you use your scoots such that you are refilling often, say at least every couple of weeks, then that should be enough. Do put in the effort to find the best fuel you can: the lowest ethanol with the highest octane. If your scoots lay around longer with fuel in the tanks, that's a problem. Definitely completely drain them over the winter/non-riding season. That includes running the carb dry, dry, dry! If you have a lot of scoots and bikes, then have fewer up and running at any given time so they see more use.
I also use "SeaFoam" fuel treatment. It is a fuel stabilizer but it also dissolves fuel deposits. It's very good at keeping those tiny low speed jets clear.