Determine the amount of hydrochloric acid or HCl used on the item you want to neutralize. Note the size of the bottle of hydrochloric acid to identify the quantity of HCl used. Most industrial applications for hydrochloric acid use less than a gallon per item washed in acid.

Put on rubber gloves and safety goggles to protect your hands and eyes from the acid.

Move the item with hydrochloric acid outside, or to a well-ventilated area, to avoid breathing fumes.

Pour 5 1/2 lbs. baking soda in the bucket per 1 gallon of hydrochloric acid used on the item. Add water to the bucket at a ratio of 1 part baking soda to 10 parts water.

Add the baking soda solution slowly to the item with hydrochloric acid, pouring no more than 1/2 gallon at a time. Wait five minutes between each 1/2 gallon pour until you run out of the water and baking soda solution.

Test to ensure the acid has been neutralized. Mix a small amount of baking soda no more than 3 tbsp. to 1/2 cup water in the bucket. Gently pour the baking soda on the item that had hydrochloric acid on it. If you notice a fizzing reaction after pouring the water and baking soda solution, pour more baking soda and water solution on the item to neutralize the hydrochloric acid. If you see no reaction, you have successfully neutralized the hydrochloric acid; you can safely handle the item. If you have any doubts about remaining acid, simply add more baking soda solution. The baking soda is safe, so there's little harm in overdoing it.