Well, sorry to have to say, but the deck wash system on my 3200 is nothing to call home about. I have tried a couple of times and it just makes an absolute mess of everything. I think it is probably better to keep everything dry rather than soaking the entire machine up with water then putting it away wet. Someone up here in North Dakota makes a special jack for lifting the front of lawn tractors, making it easier to clean the deck and unnecessary to continually removing the mower deck. The deck on my 3200 weighs close to 300 pounds, so it is better to not have to remove it. Personally...I have just driven the tractor under a low hanging branch, attached a come-a-long to the front end and lifted the front of the tractor a couple of feet, then used compressed air (lots of it) to blow all the grass clippings off. It is a lot cleaner job without the water. Remember to shut off the engine before doing this.
I don't know if I would recommend this to most owners, but I have also just taken the tractor out onto the gravel road, dropped the deck to the lowest possible position and cranked it up wide open, blowing sand and dust all over ****...but it did do a pretty good job of cleaning out the clippings. Cleaned the deck right down to the shiny metal. Basically about the same as sandblasting it. The wife really hates it when I do that.