In article , Richard J Kinch wrote:
Doug Miller writes:

Those knock-down sprays are essentially just overpriced mineral
spirits in a spray can, and should last forever.

Missed the insecticide in the ingredients list, did you?

No. The insecticide is just a slow residual in infinitesimal dilution, and
is in there for marketing purposes and to make you feel like you got
something to justify the price.

0.166% is hardly "infinitesimal".
http://app.ene.gov.on.
ca/pepsis/Compendium_reports/PDF/rptReport7_ActiveIngredient_By_PesticideProdu
ct.pdf
page 84

The knock-down comes from the mineral spirits alone. I keep a Sure-Shot
sprayer of just that around, and it knocks 'em down just as well as the
"wasp killer". Kerosene, petroleum naphtha, or WD-40 works, too.

Hell, *water* will knock them down. The insecticide makes sure they *stay*
down.

I live in Florida, so economical insect control is important. The po' folk
used to keep a rope soaked with kerosene across the door seal, to keep out
the critters.

Filling a gap with a physical barrier keeps out insects. What a surprise.

--
Regards,
Doug Miller (alphageek at milmac dot com)

Nobody ever left footprints in the sands of time by sitting on his butt.
And who wants to leave buttprints in the sands of time?