I always co-ordinate the power washing with the pest control guy. I use Deans Pest Control. I give them a call and ask when they are scheduled to put down the pest barrier outside the house. Then I make the powerwashing appointment for a day or two before. No sense having Deans spray for pests and have it washed away by the power washer.
But, any time of year is fine to powerwash.
Sorry. I just re-read your post. If you are talking about just the lanai and birdcage, any time is fine.
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