Particle board on the bathroom floor is never a good idea. 

My units were pretty cheaply constructed and have particle board subfloor (underlayment, really). 

That era of MH's used formaldihyde in the flooding if it was particle board which most floors were in those days. 

I, personally, am obsessed with old house details and hate all the flips where people tear out original 1920s bathrooms and replace them with particle board vanities, builder grade fixtures, and cheap Home Depot tile. 

They have to eat it or inhale airborne particles (usually only occurs when sanding the paint and dust becomes airborne).Lead paint is not as common as people think and the risk is pretty low.

$100- $400, very loaded question, all depends on what you put into the house. particle board cabinets, Formica counter tops and vinyl floors or plywood cabinets with stained exotic wood doors,marble floors and granite counter tops?

Think about that in two years when you replace the particle wood piece of crap you put in there - lol.I would also suggest quality-built kitchen cabinets for rentals, for the same reason (not sure what yours are).As indestructible as possible is usually the best investment for long-hold rentals, IMO.I chuckled at the 2 am bandit sign comment, are they illegal in your area?

I recently hit the 3 year mark of being tobacco free.Immediately I didn't even question the possibility that the evaporation/aerosol inhalation of two of the most commonly encountered food, cosmetic, and hygiene chemicals, glycerin and propelyne glycol, would be harmful whatsoever.I heard the hype, I asked doctors. 

It has something to do with nano particles or something like that.)  

He uses an aerosol spray to get every nook and cranny.