Schedule pressure cleaning at the wrong time, and you can expect recurring issues. Given Miami’s hot and sticky climate, the experts agree that the best times to power wash your home is after the rainy season or in late spring.   Pressure cleaning after the wet season removes mold and mildew from external surfaces as quickly as possible. A late spring cleaning, on the other hand, will clear up falling debris that may have built up during the fall and winter and any mold left by spring showers.