Because of my ninja training, I'm often forced into using various medicinal crutches to get my creaky body through the work day. It's not that I'm undergoing double-secret probation level training -- it's just that my body has acclimated to sitting in a damn chair for 10 hours a day, using only my forearm, fingers, and eye socket muscles.
At any rate, I often use a stick-on pain reliever called Salonpas. Take a hot shower, stick a few of those on your back, get a good night's rest, and you're good to go. Especially effective, the instructions say, if taken with a shot of Wild Turkey. With a bit of a chaser afterwards.
I usually buy these things at the local pharmacy -- Longs Drugs or Walgreens. Last night, a colleague let me in on a little secret. Apparently, the Asian supermarkets carry the Original version, which is much more potent than that found in the American stores. What a scoop! I immediately checked out the Japanese website for the Salonpas product. My translational ability is a bit rusty, but it seems to mention something about insect removal from car windshields. THAT is what gives it the muscle-relaxing effect no doubt. And if I'm not mistaken, it says something about taking the used product and discarding it in the recycle bin OR to use to steep a refreshing cup of tea.