I know this post is a few weeks old, but I find that this comes up a lot in our industry, so I thought I would pass along an option if available in your area. It is a service called BioSweep. The link to a video on how BioSweep works is listed below.
We use this when the curry oil has penetrated beyond an ozone treatment. While the treatment can run anywhere from $250 to $350, it can save you from having to Kilz the entire unit or replace carpets and other floor coverings. In most states, this is considered a 'damage' beyond normal wear and tear and can be charged back to the resident. If viable in your state, I do recommend having your management company look at writing the potential charge back cost into the lease so that it is understood at move-in by all residents. Something to the effect of:
The use of high potency cooking spices may create airborne soluble oils that permeate the interior room surfaces. These surfaces include, but are not limited to, walls, ceilings, cabinets (the inside, outside, tops and bottoms), microwaves, range hoods, appliances, flooring of all types, light fixtures, blinds, windows and sills.
Simple cleaning cannot be relied upon to remove this oily residue and odor. Therefore, a specialized air and surface treatment process, which may include the BioSweep treatment, may be utilized to rid the spaces of the odor from using said cooking spices and oils. The expense for mitigation of these odors and any other costs, services, or treatments to return the apartment to the condition in which it was accepted at move-in, with the exception of normal wear and tear, will be charged to the resident as damages pursuant to the Lease Agreement.
Hope this helps someone down the line! As always -- know your tenant law before you proceed with the above and consult with an attorney if you are not 100% sure for your situation when it comes to rebilling the resident!
www.bing.com/videos/search?q=biosweep&vi...21B006CC4D&FORM=VIRE