Empty antifreeze containers should be thoroughly rinsed before disposal. The rinsewater should be flushed down the drain in a home connected to a sanitary sewer. Windshield Wiper Solution Windshield wiper solution may contain methanol, detergent and water. Because of its hazardous nature, windshield wiper solution is required to have a child-proof safety cap. The most toxic windshield wiper solutions contain 100 percent methanol.
Methanol is highly toxic and readily absorbed by inhalation or skin contact.
Use and Disposal of Windshield Wiper Solution Gloves should be worn when adding windshield wiper solution to your car. Windshield wiper solution should be stored away from children adn pets, and the safety cap should be securely fastened. Whenever possible, windshield wiper solution should be used up as intended. Products containing methanol should be disposed through a household hazardous waste collection program. Do not pour windshield wiper solution down the drain or storm sewer, or dispose of it in your trash.