Kling Toilet Bowl Cleaner contains detergents and compounds that quickly remove rust, scale and hard water mineral deposits. This thickened, 9 percent hydrochloric acid, toilet bowl cleaner is ready to use and easy to use on toilet bowls, sinks, bathtubs, shower stalls, drinking fountains and ceramic tile floors. Because it clings to vertical surfaces, it provides more contact time for better cleaning action than thin formulations. Cleaner is pleasantly scented with a mint fragrance. To use, simply open the pour spout 45 degrees and squeeze the bottle to coat surfaces under the bowl rim. Let stand 10 minutes before scrubbing and then flush to rinse.