Cannabis residue compared with tobacco residue
Both need source removal, but the details differ.
Cannabis smoke
- Sticky, resinous film that can feel tacky on blinds and closet shelves.
- Often concentrated in one room or closet rather than the whole unit.
- Strong odor in fabrics and soft goods, including carpet near where the resident sat.
- May leave less visible yellowing, so the walk can underestimate it.
Tobacco smoke
- Yellow to brown tar film, easy to see on ceilings, switch plates and blinds.
- Usually spread across the whole unit over years of smoking.
- Bleeds through latex paint unless an odor-blocking primer is used.
- Residue builds up in the HVAC filter and return ductwork.
Where resin hides
Residents who smoke cannabis often do it in one place: a bedroom closet with a towel under the door, a bathroom with the fan running, or a spot by a window. That concentrates residue in places a quick walk can miss. Fan blades, the inside of the bath exhaust, closet shelving, and blind slats in that room usually carry the most.
Resin is also stickier than many cleaners expect. A degreasing cleaner suited for smoke residue, applied and wiped in sections, removes more than a general all-purpose product. Soft goods that cannot be laundered, like blinds with fabric vanes, are usually cheaper to replace than to clean.
Turn sequence for a cannabis unit
Find the room
Walk the unit closed up and identify the strongest room or closet before anything is cleaned.
Remove soft goods
Pull blinds, closet shelf liners and any left-behind fabric items from the affected area.
Clean the hard surfaces
Walls, ceiling, shelving, doors, trim, fan blades and the bath exhaust grille, starting high and working down.
Change the filter and check the return
A unit with its own air handler pulls resin into the filter and return; replace the filter and wipe the return grille.
Treat if needed, then prime
If odor remains after cleaning, schedule a whole-unit treatment, then prime with an odor-blocking primer in the worst rooms before paint.
Questions for a vendor quoting cannabis units
- Which surfaces will be cleaned, and with what type of cleaner?
- Will blinds and fan blades be cleaned or replaced?
- Is a whole-unit treatment included or only recommended if needed after cleaning?
- How long must the unit stay empty after treatment?
- What will you document for the unit file?
General information for Centennial, not a quote or professional advice. In an emergency, call 911.