Mini-split fan blades collecting weird stuff

[PButter]

HeyO, I had noticed the mini split hadn't been throwing as much air flow and shut it down to have a look.
I started cleaning it off before I thought to take a photo so the stuff you'll see has been sprayed and is not the full coating that it was when I started cleaning. I can't get a sample under a scope or anything but wonder if someone else has experienced this and what it might be. It almost seems like a moldy type of growth but again, I can't be sure.

 

[Tank333]

Do you have a humidifier in the room? Could it be deposits from not using RO in your humidifier?

 

[Natural]

Dust..minerals..or mold/mildew. If it's mildew..I would expect more varying colors..but it certainly doesn't rule it out. A prisitine cleaning and a new filter is the obvious. Hope you get it figured out!

 

[PButter]

Hmm. I don't have a humidifier- sealed room, needs dehughey mostly....

Yeah, I just got done cleaning the thing- pain in the ass- and I'm leaning towards dust/some sort of mold. Mostly it came off very easily with a stream of water- the hard parts gave up to q-tips. Might keep an eye on it and when I start to see build up try a spray of H2O2?

Thanks for the thoughts

 

[Natural]

Sounds like a plan! The added humidity won't help out much unless it's in hood-off cleaning mode..I wonder if an expensive UV light would help? I would inspect that condensate line if it has one..make sure it's 100% clear. Clean the drip pan well if it has one..and make sure the unit has a slight tilt towards condensate line. A commercial dehumidifier is gonna be your ticket to help with the water...as I'm sure you know already. Expensive, but will kick on less for less heat.

 

[deacon1503]

It would be nice if there was a mini split that had an indoor unit that was easily disassembled for cleaning purposes. Or any AC unit for that matter. Maybe someday...