Once a month?

I don't do anything at all.
Stop using it in the fall, start it up in the spring.
I have a 2 cycle string trimmer that I sometimes don't start for a
year or 2. Starts fine when I want to use it.
Who makes up these time wasting rules?

I'm 30 years into my mowing business. All my
equipment is left alone unstarted for 3-4
months each year. It used to be that I'd not
even drain the fuel at the end of the season, tho
that is no longer the case. No issues whatsoever.