I guess the room's well sprinkled with them.

For if the blood of goats and bulls, and the ashes of a heifer sprinkling those who have been defiled, sanctify to the cleanness of the flesh

For if the blood of bulls and of goats, and the ashes of an heifer sprinkling the unclean, sanctifieth to the purifying of the flesh

24 hour holding period mortality of vector strains of known susceptibility exposed for 1 hour to an insecticide sprayed surface.