I find that the outside areas, within the bird cage, need to be power washed a minimum of twice per year....I do ours 3 for sure....every 4 months. It has nothing to do with season, or who is coming or not.
All I know is we have more dust in our house here and more dust/dirt accumulation outside than any place we have ever lived. That is not a complaint, just reporting a fact as we experience it. I would gladly double any work I have to do here than put up with the kinds of weather where there are no palm trees.
If there are no palm trees then I know I am too far North.
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