Getting my "serious" cleaning done gives me a sense of well-being, and of feeling settled, that has a positive carry-over into my general attitude. I also find that it gives me a feeling of being in control of at least one area of my life - my business card says that I'm "controller," but much of the time it doesn't feel that way, so at least for a little while it's nice to have mastered one variety of mess.
One Sunday afternoon, my husband answered a phone call from my sister, and I guess she must have asked him what I was doing - he said, "She's scrubbing the kitchen sink, and she cleaned bathrooms yesterday. She's feeling much better." He wasn't entirely joking. Sometimes he calls me "Bubbles" - as in "Scrubbing Bubbles." The man is actually married to someone who gets a great deal of satisfaction from cleaning bathrooms. The satisfaction of my clean house usually lingers for at least a week or so - and then I need another fix. But knowing this task is done for the time being, and seeing the results when I look around my house, does make me feel that I'm starting the week in a better place.