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I am willing to bet that is mold.
Remedy - take it out in the sun, let the UV kill the spores. Usually helps significantly. Failing that, you will need to disassemble and clean, more-so killing the spores (or they will return). I found that hydrogen peroxide does a decent job on killing the spores, followed by a wipe with either Bintel's UHTC cleaning fluid, Astro-Physics wonderful refractor cleaning kit, or home brewed Windew with ethanol, with a dash of high-grade acetone.
If you don't - and you may already be too late - the mold will actually etch into the coatings, and eventually the glass itself.
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