Leave these on the top of the toilet or within easy reach. They are there for those times when people may be embarrassed to leave the room because of a not so pleasant event.
Firstly, all that needs to be done to alleviate this embarrassment will be to flush and then place 4 to 5 drops of oil onto the surface of the water. The oil has two ways it will combat smells. The oil will spread over the top of the water sealing in any leftover unpleasantries.
Secondly, the fresh and disinfecting aroma of eucalyptus and lemon will be the only aroma left waiting for the next visitor. This can also be added after each clean to ensure the little room in the house is always pleasant.