I have a symmons shower valve I'd like to back flush. I believe I got something that might be caught in elbow going into it. Long story about hot water temp. I don't have a drain to open for the HW drain into. Normally I'll use buckets. My washer sits a floor below the shower and uses the same line. Hot and cold lines are separate valves for the washer. I thought about connecting a hose to the hot line for the washer and run it out the window. Would work?