They cut out two holes (one is maybe 2x4 and one is maybe 1x1) to dry it out and sprayed chemicals to prevent mold, and then the holes were patched up and ceiling repainted. 

If you get a lender involved (and even if you don't) you should get a couple of things:1) Geo-Tech study - This is for the soil to be stable enough to build on2) Phase 1 Environmental - The person doing this will search title/recorded history for things like buried storage tanks or uses like businesses dealing with hazardous chemicals. 

Then they treat the tub with chemicals then with color coating.

When I say tools, I am broadly including processes, chemicals, machines, etc.

I like to learn as much as possible before I jump into something, hence my Chemical Engineering degree from Texas A&M University (Sorry, I had to throw that in there some way.).

It will include a manual more than 40 pages long establishing the standards, as well as specifying particular chemicals and other products to do the job."

RoundUp is a powerful chemical and I won't use it at our rental properties, but I have used in on pathways at our own home.

You can purchase in your name alone when you're married but if there is a divorce then it will vary by state and circumstance as far as what will happen.Another affidavit you may encounter in the future that is even more retarded is when the city won't let you pull your own permits on an investment property unless you sign a statement saying you are going to live in the property.

In the east bay, Orinda.How about chemical toilets?

Under our CA state Prop 65 Landlords must notify others even if our Gardeners apply weed killers and 100s of other toxic chemicals. if a renters kid or pet got sick we could be sued if we violated basic prop 65 rules.