How do I remove black mold from area of laundry machine where water won’t reach?
I think this is more of a comment than an answer, but I'm too new to comment :/

UV light would kill it, but you asked how to remove it so that doesn't completely answer your question...

And the EPA thinks that most home UV lamps won't do much.
https://www.epa.gov/indoor-air-quality-iaq/does-ultraviolet-uv-radiation-uv-lamps-kill-mold-0

Can you get it out into bright sunshine for a couple of days?