If you do it right, you should not see anymore in a few weeks.With persistence and a thoughtful approach (as opposed to chemical warfare) you can beat cockroaches.

There are 2 treatment methods...the heat treatment and the chemical treatment.

Additionally lot's of particle board was laced with formaldehyde which is a caustic chemical.Formica counter tops are known to have been laced with formaldehyde as well.Acoustical and popcorn ceilings in that circa were known to have asbestos in it which is a highly carcinogenic chemical and can be very detrimental to ones health.Above ceiling and wall insulation was also know to have asbestos in it.A lot of plumbing in those days was made from "Quest" Poly Butylene which proved to be catastrophic and ended up costing Shell Oil huge losses in a class action lawsuit in order to cover court ordered replacement on hundreds of thousands of mobile homes.Finally, once you start going down that road it will be like feeding a cancer that just keeps manifesting itself. 

But our model is building a passive income portfolio in coastal areas where average real estate is way too pricey for the average person.On most circa '60's & 70's homes you will usually find them in pretty poor condition and inundated with caustic and carcinogenic chemically laden materials i.e. formica counter tops, particle board sub floors, acoustic tile, floor, wall and roof insulation, etc.

Chemical Engineering, BUT my degree was probably the biggest hindrance in my investing.

I should also add that both of these cabins are full time AirBnB and have one or two locked cabinets mainly for linens, hot tub chemicals and major cleaning supplies.

Flood waters are full of every bad thing you can imagine - bacteria, sewage, farm manure, chemicals, oil...

Using colored towels means you are just covering up stains and not using chemicals to sanitize.

@Tawny Bloom - the pipe clogging issue is a result of soap and oil chemically mixing and sticking to your pipes.  

The best chemical to use is sodium hypochlorite.