How often do you guys clean out your gas tubes?

I have had several instances where I had to clean my gas tube. Again maybe it's because I shoot more. In fact I can feel when a gun is restricted by not enough gas. Then I know it's time to yank that tube out and scape it out then soak in solvent. then swab.

You guys not cleaning the gas tubes probably have over gassed guns. The tube builds up with carbon and then you feel the gun is actually running betters because it is no longer over gassed. That is until it is constricted enough that it is under gassed and you get short stroking, or failures to cycle.