For the last few decades years I've assumed that spring cleaning should happen in spring, but then if the weather is good in spring, it turns out that the garden is much more inviting and so the spring cleaning fades away. That means I feel that if any extra cleaning (sorry, I'm having great difficulty with these concepts) is to be done, it should be done now while the weather is horrible. This is Step 1. Step 2, which is yet to materialise, is actually to do some cleaning. Don't, as they say, hold your breath... 