Cleaning out a water bottle on the radiator

You can remove it from the car and wash it in the sink with a bottle brush. Before bringing it in the house please dispose of the contnts in a safe manner. Or rebottle it into a old antifreeze jug for later use / disposal.

If its filled with rust you can use products designed to get rid of rust like lime away. And then clean with warm soap and water. Use a cheap bottle brush and figure to throw it away after to prevet cross contamination of anything like food products. After liberal rinsing let dry then reinstall on your car and refill with the correct antifreeze and your all set to go.

Do Not put in a dishwasher.