I've got a Toro 21" Heavy Duty walk behind mower and when I mow tall grass or damp grass it gets clogged up frequently. I have to stop what i'm doing, take off the bag, clear all the grass out of the airway then put the bag back on. This makes some lawns take forever. Is there a better way to unclog the mower while it's still running ant the bag is fully attached? Thanks for your help.