I think I might vote for my left arm
I'm left handed you see, and I've put my left arm through it's paces window cleaning, for the 21st year and it hasn't really complained once. It still does almost everything I ask of it, although I have noticed lately that I keep knocking my fingers on things. I reckon my arm has grown an inch or two longer since wfp and that accounts for it.
Anyway, I think I'll vote for my left arm.... I suppose I'll have to vote with my right arm so as not to appear biased.