Questions and Answers for ZEP 128 oz. Acidic Toilet Bowl Cleaner (4-Pack)

A:  Yes. If you use and leave sit for hour or two it takes care of stains and calcium

A:  No. Try Zep Foaming Tub & Tile Cleaner. When used as directed, it removes tough water related bathroom stains, such as soap scum, lime scale, rust, and calcium deposits from “tile,” fiberglass, acrylic, and porcelain.

A:  ?You mean like the 32oz. bottle this also comes in?

A:  Not really. The enamel they are referring to is more likely the type used on old style metal cookware and also any enamel paints. The chemical is made from hydrochloride acid, hydrogen peroxide and plant/animal fats and works great on glazed ceramic/glass

A:  Muriatic acid, also known as hydrochloric acid, can destroy cast iron pipes and other metals like aluminum, steel, copper, and titanium. Some say that after using muriatic acid on cast iron, the cast iron crumbled in their hands.

A:  I think it will but will take a few times of use & let soak in between.

A:  Thank you for your recent inquiry with The Home Depot. We apologize you made trip to your local Home Depot store and they were out of stock of the ZEP 128 oz. Acidic Toilet Bowl Cleaner, Clear (311411943). Our stores strive to maintain an accurate inventory as possible. We appreciate your business and look forward to serving you in the future.

A:  I found this product to be very effective, and I will purchase it again 

A:  Clings to bowl. Let sit for 5 minutes. then scrub with brush and flush

A:  I think that means you don't pour it down street drains , like some people park their cars over street drains & drain the oil from their cars when doing an oil change.