My Toro Wheelhorse 520XI's 60" deck did not come with the water port hookup for a garden hose. My dealer said I could still install them though. How well does this system work when cleaning the fresh grass from underneath your mower deck? Does it remove all of the grass, or do you still have to scrape some off by hand? Will it remove dried grass that's been on the deck for a week or so? I noticed some Toro and Cub Cadet mower decks offer this as a standard option.