Question How to clean ths?

Hey, just went out to do a quote for cleaning these four sun screen panels. They are a kind of plastic-y material that is stained with some mold.
Do you have any idea if they will clean up, and with what? Maybe screen magic? Never used it before, but am loathing to scrub with detergent and have it not come any cleaner...

Thanks in advance!20150625_145006.jpg20150625_144923.jpg20150625_144958.jpg20150625_145006.jpg20150625_144923.jpg20150625_144958.jpg

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• 20150625_144958.jpg (182.1 KB)

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