Sinus heachache or pressure? Pollen allergies? Head clogged? Markus Rothkranz demonstrates how to use a neti pot to wash out the inside of your head. All kinds of airborne garbage ends up in your sinuses, and this is a super easy cheap simple way to clear your head so you can breathe and think again.neti pots have been used for thousands of years to help with allergies, pollen and sinus problems.