Solarization may or may not work. The problem is, if you have a floor that has a lot of moisture in it then you will be breeding mold and mildew. What I do is clean mine inside and out with 409 cleaner, then take a hose and rinse well, taking special care to shoot a hard spray at the points where the frame and polycarbonate touch to dislodge any eggs that might be hiding. I then saturate my floor, which is weed cloth and gravel with a total vegetation killer, let that dry then saturate the floor with orthenex insect & disease control, let that dry then close it up for a day or 2. The reason you want to let it dry is because some chemicals reactly wierdly to polycarbonate and even eat it. When you close it up in a moist enviroment then the chemcials you used become part of the humidity.

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Thanks so much for the info. Brought up some points i hadn't thought of. I also have a gravel floor and it tends to take a while to dry after it rains. I'll have to keep the moisture in mind when i clean it (watch the weather). I'm gonna get some of the Orthenex too. Thanks again.