Damage to property or normal wear and tear?

[Mary Jay]

Hi guys,

my tenant tenant was a good tenant who always paid on time, but after he left we are not agreeing on security deposit refund...

After he moved out,  he left a toilet that had black spots that could not be cleaned by regular methods (by regular methods I mean cleaning with CLR, or other regular shower/toilet cleaners), it was like mineral deposits that are black in color... Would it qualify as a normal tear and wear?

also, would mold on the ceiling qualify like wall damage or normal tear and wear? Technically, the tenant can say that it was landlords responsibility to put in a fan into bathroom to prevent mold from happening...Is it normal tear and wear or no?

Water damaged interiors- dry wall (actually probably like a wrist area) right by the shower is puffed up and bubbly, would this qualify as damage to interior? I feel like if the tenant had a shower curtain it would of prevented this...

Thank you