Pour the oatmeal into your blender and blend the oats until they resemble a fine powder.

Dump the powdered oats into a bowl with the water, baking soda, and soap.

Mix all the ingredients together, and then dump the solution into a clean bottle.

Shake the bottle before using it on your cat to combine all the ingredients once more.

Wet your cat down with warm water and squeeze a small amount of shampoo across their back.

Rub the shampoo into their fur all over their body until it reaches the skin.

Rinse away the shampoo until the water runs clear.