Just on 10 years for me also but I can't remember the exact date. I think it was late Spring. I was young then.
I'd been sacked from my job and a mate of mine had been made redundant. We were both broke and bored. I don't remember how the idea to clean peoples windows came up but with an old brass squeegie, which had a rock hard rubber, a sponge, some of my missus's t towels and an old ladder, we cleaned the windows of a few neighbours for a pitance.
We spent the 'profits' down the pub. Sounds stupid but it felt really good to have earnt a few quid.
I also still do the windows of two of the original customers we got in those first few weeks and like Tosh, what took ages then takes no time at all now.