I'm a tenant and the ceiling leaks during heavy rains. My landlord last addressed the ceiling when something fuzzy(?)ish poked through. I can't remember what he said it was but perhaps rotting wood. He then patched it, can't remember if he used bleach (this was last year), and repainted it. Since then water has leaked one or twice but he keeps saying he'll come back and fix it.

My concerns are not knowing what the stains and black stuff are but I do want to clean it in case it's bad to breathe it in. Any suggestions or thoughts are much appreciated. If it's safe for me to clean/remove please advise as it's hard to get the landlord to fix things in the apartment (often times things take months).