Originally posted by @Dustin Mercer:
No, definitely not for drywall. However, If a piece of baseboard had a small amount of surface black mold, it wouldn't be unusual for a repairman to clean it, bleach it, and keep it. Bleach is effective for a small amount of mold. Larger clusters of long-term mold will probably require more aggressive mold remediation efforts.
You can search the internet for information on this. Unfortunately, some people have a MOLD reaction to any signs of mold in a rental. I've heard people discover mold in their owner-occupied homes, read about it and take the most cost-effective way to successfully handle the situation. Most tenants will want to insist a landlord use the nuclear option with the slightest sign of mold, and spend "whatever it takes" to make them happy about it.
It's the same with many situations. If a homeowner sees ants in their house, they might go to the grocery store and buy some bug spray. If a tenant sees ants, they call their landlord and demand the landlord call a pest control company and sign up for monthly service at 100 times the yearly cost of the bug spray from the store. If a hot water heater stops working at an owner-occupied house, the homeowner might wait until the weekend to address the situation. [It goes like this: Homeowner, "can you fix this today?". Plumber, "today for $300 extra. Saturday for my regular price." Homeowner, "okay, Saturday."] If a water heater stops working at a rental, the tenant always calls immediately and wants a new water heater installed by the end of the day.
It's just the way it is.