Creating a homemade automotive clay bar can be a cost-effective alternative to purchasing commercial products. Here’s a simple recipe and method to make your own clay bar:

Homemade Clay Bar Recipe

Ingredients:

White school glue (PVA glue) - 1 cup
Cornstarch - 1 cup
Water - 1/2 cup
Food coloring (optional) - for color
A small amount of baby oil or mineral oil - for lubrication

Instructions:

Mix the Ingredients:

In a bowl, combine the white school glue and cornstarch. Mix well until you achieve a smooth consistency.
Gradually add water to the mixture while stirring. If you want to add color, mix in a few drops of food coloring at this stage.
Knead the Mixture:

Once the mixture is well combined, knead it with your hands until it becomes pliable and smooth. This may take a few minutes.
Shape the Clay:

Form the kneaded mixture into a flat disc or bar shape. Ensure it’s thick enough to handle without breaking.
Use the Clay Bar:

Before using the clay bar, spray the car's surface with a clay lubricant or a quick detailer. This will help the clay glide smoothly over the surface.
Gently rub the clay bar over the lubricated area in a back-and-forth motion. Keep kneading the clay as it picks up dirt and contaminants.
Store Properly:

After use, wrap the clay bar in plastic wrap or store it in an airtight container to prevent it from drying out.

Tips:

Always test the clay bar on a small, inconspicuous area of your vehicle first to ensure it doesn’t damage the paint.
If the clay starts to stick to the paint, apply more lubricant.