Iron OUT Automatic Toilet Bowl Cleaner, which is specifically designed to repel rust and hard water stains with every flush of your toilet. The concentrated. This powerful yet safe formula will not harm toilets, internal toilet components, plumbing, or septic systems. Use Iron OUT powder or liquid spray first to clean the toilet bowl before inserting a tablet. Simply drop a tablet in the tank and let Iron OUT ATBC do the work for you. Summit Brands began with the distribution of multipurpose rust stain remover, Iron Out, and has since branched out to include a broader line of specialty cleaning products under the OUT, Glisten and Plink brands.