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Your 'problem' is very normal since the INSIDE temp. is cooler than the outside temp. where the moisture is condensing. When it's 90 degrees outside w/90% humidity (and it's 75 degrees inside), you're gonna get condensation.
The solution may be easy. I'm gonna bet your problem is happening where there's little sun AND a lot of 'obstructions' to airflow. If ou were to trim some bushes and/or trees and/or plants (to increase sun and air flow), you problem may go away. I wouldn't be surprised to hear that you also have some mold and mildew UNDER the windows (outside) on the walls too. Again, if this is the case, start pruning!
Just for my curiosity, let me know 'how I am doing' with my 'prediction'. As I always say, "Sometimes, if you alter the environmental conditions just enough, you may solve your problem."
My best to ya and hope this helps.
Jay J -Moderator
PS: A mixture of 1 cup bleach to 1 gallon of water is enough to kill and clean any mold/mildew you have. You can use a scrubbing brush to do the job. If you want to be SURE you kill the mold/mildew, use 2 cups. Just do what you can to prevent the mixture from getting on the leaves of your plants. Oh, and when you're done, RINSE THOROUGHLY!!!