A toilet cleaning block which releases a halogen disinfecting agent in a controlled, substantially constant rate for 2 to about 4 months of constant contact with water and is then completely dissolved in the water comprises an admixture ... J Hung,R Carmello 被引量: 0发表: 1992年 Toilet rim...
A.Hi Ray. The toothpaste is just a generic way of safely cleaning the pennies, and I don't think it matters too much what brand and type are used. I believe that whitening toothpaste contains hydrogen peroxide (which is an oxidizing agent), but I don't expect that it will significantly...