I just completed a 3 day seminar on irrigation. One of the round table discussions revolved around how to clean out an existing valve box that has been back filled with dirt and debris, maybe over time or in-proper install. I was floored that this was such a problem. I explained what we use on the coast and everyone looked dumbfounded.... kinda like they had been hit with a 2X4 while watching a pair of headlights coming at them. So I thought I would share this with you all. We use a little 2.5 gallon wet/dry vac. It sucks water, dirt, mud, sand, and whatever else may be there. It's just what we do here at the beach. Maybe some of you can make use of the idea too.