Bad case of WPMLast grow how to clean room?
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Fire is my recommendation… no just kidding i would think wipe every surface down thoroughly with a water bleach solution and use peroxide or rubbing alcohol on anything you dont want to use bleach on
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Straight 3% peroxide. Never use bleach.
Increase airflow and run a dehumidifier if you can.
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I agree that peroxide is a safer alternative, especially if plants are present. If you were to use bleach you would want to make sure plants aren’t present and then clean thoroughly after to make sure there is no bleach residue remaining in your grow space.
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Definitely cleaning your space as best as possible with whatever cleaning solution you deem best is first. But what I don’t think people understand. Including myself until recently. Is that there is always some type of spores present in your grow unless you have medical grade filtration which most of us don’t. There’s always something floating around. It’s the conditions that allow it to grow! I had pm and I cleaned the room for like 2 days top to bottom and it came back! Because my environment was to humid without enough air circulation. The 2nd time I was sick so the flower got the 30min scrub! But I added 2 more fans and raised my dehumidifier up about 24” off the ground. That was almost a year ago! And I haven’t seen it since. Do the best you can cleaning. But there’s no amount of scrubbing that’s going to make up for lack of environment control. 
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What I would do is…
Follow their info 
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Fought WPM when living on the Central Coast in California. Living in Colorado, due to the dry climate and high elevation I’ve never seen even a hint of it. Run a couple of grows at 60% RH with zero trouble. So this is definitely a thing. Best is prevention in your climate. RH should be below 45% in flower with tons of air flow.
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