If ever you find that your base is getting dirty, try this tip!
Depending on the size of your hookah base, you need one to two cans of diet coke. Fill the base with the coke slowly (to avoid mess). Let it sit for at least 24 hours. Pour out the coke and rinse very very well. You will need to make sure that all the sugar and high fructose corn syrup is out of the base. This should be done every time you use a base that is not water. Using this method will keep your hookah squeaky clean!