If you don't drive the car in winter ice / salt , remove the coolant hoses and plug them with a metal slug. ( Brass is better. )

When I replaced all the coolant hoses on my 97 SL320, I eliminated the heated washer tank, windshield base and unplugged power to the heated nozzles. My car used T hoses to tap into the heater water so I replaced them with straight hose.