Watkins toilet bowl cleaner the most powerful bowl cleaner available.You simply can’t buy a better, more powerful toilet bowl cleaner anywhere! Cleans better, yet is safe for septic tanks. For use on vitreous china only. Advanced hydrochloric acid (hydrogen chlo- ride) formula: Hydrochloric acid (HCl) is the most powerful cleaner known for use on toilet bowl stains, yet will not harm septic system. Concentrated: Contains up to twice as much HCl as some products, making it much more economical to use. Dimethyl benzyl ammonium chloride: Deodorizes and disinfects. 
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