We are replacing our washing machine and need to disconnect the old one before the new one arrives. I need to turn off the shown valve so that I can then remove the attachment on the bottom, pointed to in the second photo. I can't budge the valve *at all*. It's possible it hasn't been turned in 15 years. I've soaked it in WD-40 over a couple days, without obvious progress. I was able to turn off the other valve relatively easily. Thoughts?