It’s surprising to learn that, no matter how bad your radiator is, you can clean your vehicle radiator with baking soda, it can clean clogged pores, corroded and rusty radiator transform into really clean and smooth.
It’s an old technique of flushing and cleaning out radiator in a cheap way, very effective in case, if you don’t have any dedicated cleaning chemical for radiator.
If you think it could hurt your vehicle’s radiator, don’t hesitate to use it, it’s really safe and sound and possibly the safest, for instance, in some conditions such as you couldn’t find or purchase special chemicals.
Before you step into how to clean a radiator with baking soda, you need to learn what baking soda is and why it is a useful cleaning solution and remember to add vinegar with baking soda as both create a chemical reaction that involves this.

Baking soda and vinegar are two strong products people love to use for cleaning. Each have their own individual sanitizing perks, according to Brian Sansoni of the American Cleaning Institute, an expert on all things cleaning. “Baking soda is a natural deodorizer and a fine abrasive; that’s good for odor absorption and scrubbing. Vinegar is especially great at lifting hard water stains. When you combine baking soda and vinegar, you mix an acid (vinegar) and a base (baking soda) which creates salty water and carbon dioxide gas. The reaction has an immediate ‘clean’ look, but when you look deeper you realize that you’re left with saltwater. The agitation of the fizzy reaction itself can be useful to physically break up and carry away dirt.
Baking soda is sodium bicarbonate: each molecule of baking soda contains a sodium atom, a hydrogen atom, an oxygen atom, and a carbon dioxide molecule.
Vinegar contains acetic acid, each molecule of which contains a hydrogen atom, and an acetate ion.
When combined, the hydrogen atom in the acetic acid meets up with the hydrogen and oxygen atoms in the baking soda to form a molecule of water, while the acetate ion grabs onto the sodium atom and forms a salt, sodium acetate. The carbon dioxide molecule, free of its other chemical bonds, can now escape, and bubbles forth as a gas.

The amount of baking soda and vinegar remains equal to 6 tablespoons each, which will provide the best outcome.
For more in detail here is a Video for better understanding of How to Clean a Radiator with Baking Soda