Cheapest route I found is white, blank chloroplast signs on amazon, a box of magnum sharpie markers, nails with plastic washer on them at big box store, and my wifes nice handwriting.

But, If your signs are corrugated plastic, like most professionally made signs, then put them up.

They put a circular piece of plastic over the drain and a wash cloth on top of that.

We replaced the floors, updated the kitchen, replace plastic bathtubs with tile and frameless glass doors in all the bathrooms, and closed the screened porch to add a master bedroom W/M bathroom and closet.Added a dwelling under the new master bedroom kitchen and new deckThe townhouse had an original 1323 sqft with the addition came to a total of 2000 sqft.

A family member bought a condo and the pipes needed to be replaced because the plastic originally used was prone to breaking. 

That looks like a plastic bumper over a metal frame.

When I was about to leave, a neighbor told me to check plumbing before closing because she was told by the deceased person who lived there that it clogged and he defecated and through it out on a plastic bag on the trash.

If remediation is required, I would need to hire a special team to seal off mold areas of the units with plastic and execute the removal. 

I have seen plastic drapes an mini blinds to help keep water off the sill for privacy.  

If the wiring is sheathed in vinyl/plastic, I wouldn't sweat it.