Technical University of Munich (TUM). "Hydrochloric acid boosts catalyst activity." ScienceDaily. ScienceDaily, 25 August 2020. <www.sciencedaily.com / releases / 2020 / 08 / 200825110652.htm>.

Hydrochloric acid is a chemical most commonly used in cleaning products. According to the National Library of Medicine, hydrochloric acid is a colorless watery liquid with a sharp, irritating odor.