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“The person with the hose may well have done the right thing by accident.” Whirly

Hosing it down would lessen the life time to 10-15 hours apparently, but not kill it. This might make it look clean and safe to walk on but really it would still be contaminated.

All just speculation; in many places it would be left there days for unsuspecting people to walk through or as pointed out animals to walk on, or maybe eat. A dog or cat licks that, then goes into the house and licks the kids or itself.