Add baking soda to your spray bottle. I didn't really measure. If needed, start with 1 tbsp.

Add white vinegar to your spray bottle. Pour slowly because the mixture will start foaming and bubbling. I didn't measure, so add as much or little as needed.

Add hot water to your spray bottle. Again, I didn't measure. Add as little or as much as you'd like. For each batch I made, I only made about 8 oz or less of cleaning solution at a time.