I spent close to 5 hour scrubbing, bleaching, taking apart the fridge, gaskets, internal housing inside the freezer and fridge compartments.

Bleach with water cleans up a lot.I'd get an assessment of the extent of the issue.   

I verified with my two main cleaners what cleaners they use and that it's bleach/anti-bacterial and not just smell good Fabuloso or something.

Otherwise, mop with soap/water, mop with bleach/water, dry out, apply 2 or 3 coats of Kiltz, then a couple coats of transparent sealer. 

Cleaners with bleach and or abrasives will shorten the life span.  

@Alison Cummins I bought a foreclosure, last owner let the cats run the place we demo everything and have been cleaning with bleach and painting with Shellac. 5 weeks later still cannot get rid of smell.

One additional thing I would do before the ionizing  and the Kilz is to bleach treat entire area with a 50% bleach water mix.

I can never get grout to look clean no matter how much I scrub and bleach it.

-Every single carpet had stains all over it (most came out with professional carpet cleaning except the paint and bleach stains).

If you hire someone to do your landscape - mowing the lawn, prune trees etc... on a monthly basis, you might want to drop by once every 2-3 months to make sure the lawn maintenance work is satisfactory.I suggest you personally go change the air conditioning filter every 30-45 days.These two combined should give you a good excuse to stop in to inspect your property without them feeling like you are watching them.Add to that the occasional need to go pick up mail (in case not everything is forwarded or changed), as well as actual repair work...you have plenty of opportunity to go inside without any specifically scheduled "inspections".I tell all my tenants up front I will come by every month to change AC filters, bleach the condensate line, throw some ice and lemon peels into the disposer.