Natural Acid Bowl and Porcelain Cleaner. Contains the same citric acid found in real lemons. Use with confidence daily on a variety of hard non-porous surfaces. Deodorizes and freshens as it cleans!When the task requires more aggressive restroom cleaning performance, NABC Plus IV Natural Acid Bowl and Porcelain Cleaner is the environmentally sound answer. Four percent natural, organic citric acid and biodegradable surfactants are the mainstays of the NABC Plus Iv Natural Acid Bowl and Porcelain Cleaner formula. Phosphate free. NABC Plus IV is the natural solution to tougher restroom cleaning tasks.