Study Duration 2 A washout phase before entering the study is required for the panelists. During this period, the application of any skin care, UV protection products, and topical medications must be avoided to the test sites. Personal hygiene procedures should also be standardized during this phase namely the number of bathing per day (most commonly restricted to once daily) and the use of preselected cleansers (e.g., mild soap provided by the study team). The duration of the washout period varies and 1 week is generally considered as sufficient not to interfere with the study preparations and procedures.