I'm getting this a lot this year due to all the rain. I explain that the system should always be charged every year. regardless if its a wet year or not. Explaining that its hard on the valves and solenoids. Either way, I have yet to convince anyone to still blow out due to water that may have infiltrated the system. Lost revenue this year, but may reclaim some back when they try turn system on and all the valves are sticking open. Any advice?