On page 3 of the user manual, it mentions that you can use the Sanitize cycle with towels.
"When you select the NSF certiﬁ ed Sanitize cycle, the water is heated to an extra high temperature and removes 99.9% of certain bacteria typically found on clothing, bedding or towels. This certiﬁcation is awarded by NSF International, an independent third-party testing and certiﬁcation organization. Please check the garment care label to avoid garment damage. Only sanitizing cycles have been designed to meet the requirements of this protocol for sanitization efficacy."