Watercolor artist working with Yupo pad and each sheet fingerprint resist appears when watercolor is applied. Have you a suggestion how to remove? Should all sheets be washed prior to use? Dawn dish soap? Peroxide? So frustrated with Popup fingerprints I love the eccentric way colors move on the paper!

Here is a step-by-step article written by the artist Sandy Sandy explaining how to remove fingerprint oil from sheets of YUPO:

http://www.sandysandyfineart.com/blog/removing-oil-spots-from-yupo-paper