I recently cleaned a fuel bowl full of deposits from my lightly used garden tractor, supposedly from ethanol. The engine would start fine by spraying starter fluid but was not getting gas. I was surprised at how much stuff was in there. I had also tried dumping cleaner type fluids into the carb, but to no avail.
Like most, it turned out to be an easy fix once the solution was known. I'm using ethanol free for the foreseeable future, will be interesting if it happens again.