Zep Acidic Toilet Bowl Gel Cleaner 128 oz.

I am a retired custodian and have purchased my cleaning products from janitorial supply stores previously. They have all folded or relocated and are no longer accessible to me. This acidic toilet bowel cleaner, though possibly not as strong as janitorial products, is highly effective in removing mineral deposits if used regularly and far more effective than any commercial brands available to the general public as far as my research has discovered. You should be very satisfied with the performance of this product.