I have had good luck with chemical treatments.

(The irate tenant does woodworking/crafting and uses strong chemicals daily).My office manager felt unsafe and suspected that the tenant was under the influence of drugs, so she called the police, closed the office for 1 hour, issued a lease violation, and immediately walked the other unit where the tub was being resurfaced.

If there are any sensitivities to chemicals, cinnamon works.

I know this is harsh, but I challenge you to look at your circumstances from a different perspective.

@Dave Rav I know it doesn't help now and it sounds a bit harsh, but these are definitely questions I would make sure you have answers to before telling the tenant you won't be waiving any late fees.

I'm not trying to be harsh so don't read it as such...haha.Happy Housing,Matt

The 2% rule properties are harsh in Baltimore as well as most places. 

They estimated $98,000 for the job and wrote this, basically saying that it's impossible to fix without also replacing the drywall and insulation, and that chemicals and paint would not be enough:"The odors and residue from the smoking are very apparent and appear to have permeated all areas of the Residence to such a level that these odors and residue, that is oil based, cannot beremoved by means of scrubbing with a detergent solution, application of a deodorizing solution, and application of a stain blocking type paint. 

I am a Chemical Engineer (by profession) and now working in Consulting for Chemicals, Oil ans Gas companies.

I am a Chemical Engineer and now working in Consulting for Chemicals, Oil ans Gas companies.