Are you speaking of commercial or home owners or both.
The first step for avoiding small engine carburetor problems is to avoid the use of ethanol laced fuels--get straight gas if possible.
There is a website that lists stations that to sell straight gas--if I remember correctly, I think it's www.puregas.org
. If not someone will correct the addy.
My suggestion is to run, then drain fuel and restart to run dry--on any equipment that is going to be idle for an extended period. Your mileage may vary.
Ethanol contributes to corrosion as well as leaving deposits. In addition, ethanol is a water attractor--as a result it absorbs moisture from the air.