Social culture, accepting personal responsibility, educating oneself, not getting into trouble, enforcement and harsher punishments for gang-related and violent activity, responsible spending and even remotely decent financial choices (it's amazing how many people in the ghetto get weekly manicures and plasma TVs), additions, desire to work, access to food and heath care (mental healthcare included), safe childcare, etc. has to change before pretty buildings will improve a community.

The major problem that we have is that our landlord also operates an appliance business in their back yard (which is super noisy and constantly smelling of chemicals and spray paint), and when we've asked for repairs, they simply send in their appliance guys who half-*** the repair job, and a month later it's broken again anyway.

Is it bleach everything and replace floors, is it some kind of chemical cleaning product like SCOE 10x on the floors and walls, ... 

A lot of times being a landlord it is about minimizing your exposure to liability.If a tenant or their guests or kids were to get hurt on the property, you can easily expect yourself in today's society to be involved in an very costly and possibly very long lawsuit.We advise owners not to leave on lawnmowers, ladders, weedeater's, yard equipment, or even cleaning supplies and chemicals.

When looking at investment property, pet odors smell like money.I bought one of these a few years back and was prepared for chemical warfare. 

Now when you walk it there is a very strong chemical smell and we can’t pinpoint what it is.

Electricity, chemicals, scaffolding, spinning blades, etc. 

Cleaning the air handler coils when dirty, changing filter, using A\C pan tabs, blowing out the drain line with shop vac and using chemicals to deter growth in drain lines all seem to help. 

Oil is used to pave roads, make plastics, produce solvents and other chemicals.

We heard from a garage door contractor he would not put in his garage doors knowing a pool would be in there since the parts get corroded from the moisture and chemicals.