No "30-Day Money Back Guarantee" as advertised on Oclean website.
Oclean Air 2 seems like it is barely getting the job done. Wimpy. I wrote for the "30-Day Money Back Guarantee" and received this in response from Oclean: "Since it is a personal care product,we can only accept the return if the products are unopened. Already opened the package is not supported by the return. If there is no quality problem, you must return the product, you need to pay for the shipping cost and customs fees to China."