Toilet cleaning detergent specifically designed to combat black stains, with good foaming action and easy to use. - Product Name: Sabotta Ring Oomori Awa (Neglected Ring Extra Foam) - Purpose: Toilet cleaning detergent - Instructions: Sprinkle this product into a toilet filled with water, let it sit for 30 minutes to 1 hour, then scrub and clean with a brush. - Features: Black stain prevention, good foaming action - Contents: Not specified - Country of Manufacture: China I purchased this but never used it, and it has been stored at home. The box has some minor scratches, but the product itself has not been used. I will flatten the box for shipping! Thank you for looking.