Service is counted as effective from the date of mailing.

What are the best (most cost effective) products people here have had success with?

Not quite as effective, but does the trick also.  

Cash for Keys" might be your most effective option.

We need to be aware of the safety issues regarding the products we use in our industry as health issues from environmental causes effect not just our investment but our livelyhood

And if you can take the stress of moving every few years then "serial owner occupancy" is a very cost effective way to build a portfolio.

There are hundreds of issues that can effect that property value leaving that partner or lender without sufficient security.

Yes doing DILs would be great if we can track down previous occupant but my fear with this is that any liens after the first would still be in effect so I'd have to do my diligence to make sure there aren't any other liens on the property.

We are trying to find out the best/cost effective way to refinish or remove. 2 of the photos are of the fire place and it looks like this may be a panel that was placed over the original drywall and then finished. 

A "air freshener" will not put out enough to be effective at eliminating odors and kill insects.