Yesterday I was supposed to wash a jet. No big deal, we do it in a hangar. Well, the jet didn't get towed in until 3:30 AM. This means when I came in at 7:00, the jet was still a popsicle. I could throw a glass of water on it, and the water would freeze in about a minute. Moved the wash day to Friday for that jet and told the Crew Chiefs that we needed the jets in the hanger at least 8 hours prior to a wash to warm up. Now today, I'm supposed to wash a different jet. I get in around 6-ish, and the hangar doors are wide open (and it's 6 degrees outside). Close the hangar doors, no jet in the wash spot. The jet gets towed in around 8-ish. I ask the tow-supervisor "What am I supposed to do with this, it's 6 degrees?" His response "Wash it" My response... get garden hose, spray wing. Watch water almost instantly turn to ice. "Now what?" He just had a stupid look on his face. Now I get to come home, take a nap, then come back at 4 pm. Hopefully it will thaw out by then. It takes 3 hours just to warm up the hangar after the doors were opened.