For routine cleaning and ear mite prevention. Utilizing Eucalyptol which helps promote healthy ear tissue and aids in the prevention of ear mites. Marshall Ear Cleaner washes away dirt and wax painlessly without the use of swabs. Helps to promote healthy ear tissue and aids in the prevention of mite infestation in ferrets. Ferrets are prone to build up and wax problems so it is important to inspect them regularly.. Eucalyptol. The Marshall Ear Cleaner Washes Away Dirt And Wax Painlessly Without The Use Of Swabs.