Nana C is a great degreaser which you can apply in toilet cleaning. Nana C can be highly effective at mitigating restroom odors and stubborn stain, especially urine odors. Toilet cleaning: Pour directly into toilet or spray directly on the stained area. Leave it for 15 minutes. Wash it with brush and rinse it thoroughly. Tips: Toilet Flush Tank Add one cap of Nana C into the flush tank periodically. It helps to remove hardened mineral deposit in the tank and reduces the spread of bacteria.