Citric acid is a builder that can also be found in a wide array of household products including laundry detergents, shampoos and cleaners. Of course, citric acid is also found in citrus fruits, such as oranges, lemons and limes. It makes a product formula clean better by affecting the molecules in the formula so they work together better. Citric Acid can also be used as a pH adjuster that alters the pH of a product to improve stability. Every formula has an optimum pH to make it work best. For example, a formula that’s more acidic works better for soap scum removal. Its opposite, a formula that’s more alkaline, might be more effective as a carpet cleaner. We use pH adjusters to make sure we achieve the best pH for a particular job. Also, the pH of a formula can affect how long it lasts within a container – for example limiting its tendency to rust in a can. Citric Acid can also be used as a cleaning agent that removes dirt, or as a chelator.