Filip Nine O Toilet Bowl Cleaner - Qt. A 9% hydrochloric acid toilet bowl cleaner that effectively cleans, deodorizes, and disinfects porcelain, ceramic or vitreous china toilet bowls and urinals. This low acid cleaner provides rich sudsing action leaving toilet bowls and urinals sparkling clean and eliminates offensive odors in the restroom. Faint blue color alleviates any staining concerns. 12/cs, Qt.