I started 35 years ago when I was 18 with my mate steve to earn some spending cash. We worked Saturdays cleaning windows on the South Ruislip estate where Steve lived. We had to work there because we had to carry the ladder everywhere, we had no transport.
I am now 54. For most of the intervening years I have done a bit from time to time but with long gaps. Now, when I thought I would be finished with such things I am a full time and enjoying it. Its a healthy job and I like the freedom.