A rear bagger's cloth/poly type grass bag should be considered a routine maintenance item the same way as the underside of your mowing deck is, just not quite as often. I use a whisk broom once a week on the inside of mine to unclog the pores. If you've never done it, you may need to use a scraper to knock off major accumulations. You can also power wash these things which does a good job, but will render the bag out of service until it dries.<p>As a previous poster said, it's all about air flow. Deck design and bagging material work in sync to produce the maximum quality cut.<br><p><font size="1">Edited by: turfquip dot com