good someone posting on topic...so how long does residual scent last...1 month...2 months ...3 months
The examples below are referring to an undisturbed, unoccupied and not regularly cleaned, closed building.
In normal circumstances I would be very surprised if scent lasted more than a couple of months(inside or out), but I could be wrong.
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Excerpt.
What we have found so far is; residual scent will last 1 year
in a building with minimum environmental influence, or human disturbance. Even after the objects where the scent source had been were removed, the dogs were able to locate the rooms, general area, or pinpoint where it had been.
Excerpt.
Since the original set up date on November 9, 1996, we have returned to the building 4 times: January 8, 1997, April 2, 1997, July 23, 1997 and December 7, 1997. On our visit in April we found that they had removed most of the original furniture and some boxes of trash, so the building had little left in it. Two of the objects (the ironing board and a box of trash), that had held scent sources were now missing.
Excerpt.
Room #18 - area where trash can had been - dogs all indicated
area and showed pile of curtains now on floor but had been
hanging above trash can originally. Curtains are porous and
holding scent.
Excerpt.
Our next step in studying residual scent is to set up problems in different environments. We want to compare our results with problems set up in open areas, areas with sun and shade and no building to protect the scent.
http://www.csst.org/residual_scent.html