Patients were evacuated from Memorial Medical Center in Neillsville Friday night after complaints of a chemical smell in the building.
The fire department was called just after 6 p.m. Friday when maintenance workers reported a strong chemical odor. They shut down the ventilation system to keep the smell from spreading.
When fire crews arrived, they evacuated the hospital, clinic and assisted living units as a precaution.
They later traced the smell to a maintenance elevator in the lower level of the hospital. They eventually determined the smell was coming from a solution used to clean instruments that had leaked from a sealed container. The ventilation system spread the smell through the building.
Patients were moved back into the building after fire crews gave the "all clear" at 7:25 p.m. There were no injuries or damage reported.