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Black paint like stain

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So we were away for awhile came back to an out of order hot tub (hopefully I can fix that), but when I opened the lid, I never seen anything like this, the horror....from all my jets, it's this black paint like stain, and it's really difficult to get off with just scrub bing....any clue to what this stuff is and how to get rid of it would be greatly appreciated.


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Frankly, I'd be more concerned about the rust. 

Give us some details (year, make, extras like salt cell or uv) and pics of the equipment area and circuit board so we can see what you've got in there. Also detail your maintenance routine and what you did before/while you were away.

@waterbear, ever see anything like this?

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Spa: caldera martinique paradise - 2014

using saltron mini spa sanitation system since 2014, replaced in 2020

2016 heater was replaced under warranty

Both jets replaced in 2020

regular maintenance was drain every 3 to 4 months, clean, replace filters when needed, up until I was away, it seemed to stop running during this time as I notice the breaker was thrown and if I switch it back, within 10 seconds it's blown again - I suspect the heater this time again...

pictures included....heat pipe looks to have some corrosion goop on int 




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