Granny's mixing up a batch of her soap,Mrs Drysdale complains to the smog commisioner. The smog commish. arrives & Granny chases him off with a shotgun. The commish.is up for re-election,so Mr Drysdale suggests Jed run for Smog Commisioner. Jethro invents a filter for car smog.(only problem is it's too big.!)