The chemicals have to be in contact with each other in order for any type of chemical reaction to take place. One of the most common examples of a chemical reaction is the rusting of a fence. The combining of the metal and the oxygen causes bonds to break and new ones to be created, which results in the creation of iron oxide or rust.
The ear canal cleans itself with a waxy secretion called cerumen. Cerumen is resistant to water, sticky (to trap dust) and migrates out of the ear canal to self-clean the ear. Sometimes, the wax builds up and causes symptoms, including mild deafness and a sensation of fullness inside the ear.
Otherwise known as ear wax. Produced in oil glands in the auditory canal. Helps protect and lubricate the ear. Barely a liquid at body temperature, which causes it to flow slowly out of the auditory canal, carrying dirt and dust with it, making the auditory canal self cleaning.