Then I empty/ clean them out, bleach or spray killz all over, board them up, keep the grass cut and wait for the next season and flip them for 20k+ Or often times hold and rehab if the crowd has changed. 

The homeowner claims she "will fix it" with the dixie cups and bleach I saw on the kitchen counters.

Wash them with a 20/80 bleach water solution, cover them with 2 coats of Kilz oil based primer, and then cover them with 2 coats of transparent sealer. 

I would buy some bleach, scrub until its gone, and let the buyer know it is gone. 

Then I cleaned up all of them with bleach, put new handles on them, and a new formica counter top. 

They will bleach to death and/or destroy what they are washing.Make sure you have at least 3 sets of sheets and extra pillowcases for short turn over days.

You will need to scrub the toilet daily with bleach or ammonia in order to prevent "viruses".

Okay so in my apartments I tell the previous owner (I recently just bought them) that I plan on going in once a month and changing the air filter.This way the units can be inspected some and also I know the power bill won't be as high for the tenant and the low air flow won't burn out the fan motors faster.The seller mentioned to me that I should also check the toilets as well.The seller stated that tenants like to put those chlorox bleach tablets in the toilets and it eats up the flapper valves.This causes a water leak and runs up the water bill for the landlord.Here the water is included in the total rent payment each month.So should I ban the chlorine tablets from the toilets or should I just replace the flappers all at once??

there was cat pee and human odor throughout the house, the front door had been smashed in and it was without a security screen, the kitchen bench tiles were breaking off and the wood underneath was sinking in due to it constantly being wet and moulded out, the skirting boards were disgusting and the shower had so much soap scum that it took me 8 times with bleach and hard scrubbing to get it halfway decent followed by another 6 times to get it to where it was clean enough.

the first is oxygenated bleach...you can find it on the net and i use it all the time to clean my grout in the kitchen...you mix it and let it dwell for around 2-3 hours, scrubbing lightly as you apply it.