Liquids are not allowed in the garbage. Put unwanted or used product in a sealed container and take to a HHW location.
No containers over five gallons in size and a 50 gallon over-all-limit. Call the Household Hazards Line at (206) 296-4692, 9 am to 4:30 pm, Monday through Friday, except holidays for further information.
Do not pour down drains, into toilet or stormdrains, or pour into soil. These all cause water pollution.