Question: how to clean evaporative cooling system?
Answer: Step1 : Remove panels and cooling pads. Unplug the cooler and turn off the water. ... 
Step2: Drain water out of the air cooler. Open the drain plug if the portable air cooler has one. ... 
Step3: Brush out the inside of the cooler. ... 
Step 4: Soak the water tank with vinegar. ... 
Step 5: Scrub the water tank.