I have black dots on the lip vent of my split type unit in main bedroom and living room but not in 2nd bedroom

previous tenant i doubt used dehumidifer and cooked with door open

i got black gunk on the 2 a/cs and i wiped it with tissue and it ws black - accidentally breathed some in so i figured if its mold i got sick from that ... could it just be dirt?

anyway, is this landlord responsibility? i jus tmoved in ... aptment was dirty and i cleaned but im afraid inside of ac is moldy?

also can i clean this myself (with my maid) or gotta get a pro to do it

i had my maid wipe but she missed a lot of spots and couldn't really stick her hands in