On Tue, 19 May 2020 20:37:05 -0700, Bob F wrote:

On 5/18/2020 7:09 AM, Ed Pawlowski wrote:
On 5/18/2020 1:02 AM, wrote:
Same issue here. I have a living room 30year old GE thru-wall-unit
made in Japan that still works! Came with my condo and for the past 3
summers it has spit pepper size black particles onto the floor that
are soft and easily smear when I clean them almost daily. I took out
this very heavy until in 2019 and throughly cleaned it with paper
towels and vacuum and it was disgustingly dirty and rusty. Less
particles spit out but it did not stop. I live in Chicago area so I
cover the until both inside and outside to stop the cold air from
coming in so I'm wondering if this would build mold, however my
bedroom a/c does not have this problem. I really miss the mini-split
a/c units we had in Europe, seemed cleaner and more efficient system.
I'm thinking of purchasing a new unit this summer as as I jokingly
googled it but seems I'm not crazy now but even more disturbed. Cancer
survivor here so its scary to think it could be mold. Good luck to you
all in resolving this issue!

Sounds like mold.* I'd get the coil and fan professionally cleaned
outside of the house.

Or rotting foam "insulation" or padding.
I.ve seen that before - but the rubber was not only rotted but slimy
- with mold or something very mold-like that came off with bleach -
bleach does not take off rubber - - - I cleaned it up and used some
weatherstrip foam tape to replace the "seals" then sold it.