The situation

Illustrative example. Not a real job or customer.

A hypothetical household has a low cedar deck off the kitchen of an older house near Washington Park. In early spring, a skunk sprays under the deck. The household hires the first available provider, who runs an ozone machine inside while the family is away for a day and sprays a scented deodorizer around the deck edge. The house smells fine for about a week.

  1. A May thunderstorm soaks the yard, and that evening the kitchen and back bedroom smell strongly of skunk again.
  2. The household worries a new skunk has moved in, but finds no fresh digging and no tracks.
  3. A second provider asks where the spray happened and goes under the deck by lifting two boards.
  4. Under the deck, the soil and the undersides of the boards still smell strongly; the earlier treatment had not reached them.
  5. The top layer of soil in the spray zone is removed and replaced with gravel, and the undersides of the boards and joists are treated with a neutralizer, then allowed to dry.
  6. The kitchen doorway area, a nearby rug and the back bedroom curtains are treated; the scented residue from the earlier deodorizer is cleaned off.
  7. A sprinkler head aimed at the deck edge is adjusted, and the deck perimeter is closed with buried wire.

After the next several storms, the smell does not return. The household spent time and money twice, but learned what a lasting treatment has to include.

The two treatments side by side

First attempt

  • Treated the air inside the house
  • Added fragrance outside without reaching the source
  • Did not go under the deck
  • Left the soil and wood untreated
  • Looked successful during dry weather

Second attempt

  • Found the spray zone under the deck
  • Removed contaminated soil
  • Treated board undersides and framing directly
  • Cleaned off leftover fragrance indoors
  • Addressed the sprinkler and the entry gap

Why the first approach failed

Ozone and fragrance both act mainly on air and on exposed surfaces. The oily residue under the deck sat in soil and in unsealed cedar, protected from the indoor treatment and only lightly touched by the spray around the deck edge. As long as the weather stayed dry, the residue gave off little odor. When rain soaked it, the compounds in the spray that react with water released a fresh round of smell, and the open kitchen door and window carried it inside.

The lesson is not that every first treatment is bad. It is that a treatment plan should start with the question 'where did the spray land?' and should include that exact spot.

Signs a treatment may not have reached the source

  • Nobody looked under the porch, deck or into the crawlspace
  • The house smelled perfumed afterward rather than neutral
  • The smell faded quickly but returned with rain or humidity
  • The strongest smell is still near the same exterior spot
  • No materials were removed, even though spray hit soil or insulation

General information for Washington Park, not a quote or professional advice. In an emergency, call 911.