1995 Cadillac DeVille Owner's Manual - Page 117

NOTICE: When using concentrated washer fluid, follow the manufacturer's instructions for adding water. Don't mix water with ready-to-use washer iluid. Water can cause the solution to freeze and damage your washer fluid tank and other parts the washersystem. Also, water of doesn't clean as well as washer fluid. Fill your washer fluid tank only 3/4 full when it's very cold. This allows for expansion, which could damage the tank if it is completely full. Don't use radiator antifreeze in your windshield washer. It can damage your washer system and paint.