I don't know why this didn't dawn on me before, but you must have cat hair over everything.
It sticks to the walls. I have to sweep them occasionally. I found a cat hair in my belly button.
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When I had to take a teaspoon of dust from the vaccuum to an allergist what I took him was a teaspoon of dirty cat hair. It is everywhere. And difficult to dislodge.Re Blossom: 'If I fits, I sits'.
My brother has fluffy cats and he says the fur forms drifts at the edges of the rooms if they dont vacuum regularly