h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

I have recently been recommended wd 40 for my ..... wait for it.... knee problem!! Yes thats right I had a very painful knee problem for several years although I never got round to going to the doctor's, it was begining to interfere with my life, and someone suggested wd40, I rubbed it on my knee and the next day there was a hugh improvement. I have to say my parents both swore by it, but I thought they had gone slightly mad, well it appears I have either done the same or the stuff works. I was curious if anyone else had tried it for creaky knee's?? Did it work??