Final answer:
The recommended post-procedure step for maintaining cleanliness is to disinfect the drain plug with alcohol, which helps in eliminating residual microorganisms.
Step-by-step explanation:
The post-procedure step recommended for maintaining cleanliness after cleansing the drain plug with alcohol is disinfecting the drain plug with alcohol. This is because disinfection will help eliminate any residual microorganisms that may have been left on the plug after emptying and ensure that it is safe to use again. It is important to follow proper sanitation procedures to avoid infections or other complications.