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Ah, washer as in hose kit, not nut, bolt, and washer..... LOL!
I've had them and don't use them anymore. They make the grass clippings under the deck all wet and yukky. This wet crap sticks even more to the deck and then drops this really dark green oily crud all over the mowers parking spot. When the yuk dries, it glues itself to the deck and becomes even harder to clean. I'm not a fan.
Instead, I clean my decks by hand with a hand made wooden scraper and then spray on a graphite film. The grass doesn't stick as well to it and comes off as you mow.
Every so often (a year or 3) , I clean the deck again by hand and apply more graphite.
Every deck I've owned since I started doing that has lasted at least 3 decades. One is still going at 4. Truth is that I've never had one rust out after using graphite. Never.
I sometimes wash the top of the deck lightly, but I prefer not to wash anything. Just blow it off with a leaf blower. I live in the corrosion belt so I don't like adding water to the life expectancy formula.
Also, I never mow wet or even damp grass.