ever had black mold in a rental property?

[Ryan Arth]

i know this is a rookie mistake, but believe me i have learned from it.

so i have a rental i just picked up, and it appears to have had water sit in it at some point. we find some black mold around the baseboards and in a couple of cabinets. the house is on a slab.

is this a serious problem? as in, can i fix this myself with a facemask, a spray bottle and a mop, and lots of bleach?

any experience with this or suggestions. i thank you all for your time.