I tend to do jobs as and when I think they need doing, so no, I don't do a spring clean as such. I do, however, do the curtains in the warmer weather so that they can be dried outdoors, but not all at once. Any cleaning needed behind heavy furniture that is impossible to move by me on my own, tends to be done when we decorate a given room, though I've got one of those flat duster things that I'm able to get so far behind the wardrobes. Cupboards get emptied and cleaned when the mood strikes me, which can be any time of year. ?
I agree with the poster upthread who suggested the traditional spring clean was done to clear away dust, grime and smoke residue from all the indoor fires that were much more common place at one time (and heavy industry such as coal mining and steel production, which threw lots of particles into the atmosphere and properties).
Having said all that, I really must tackle the oven! ?