Yup, makes sense, and again I think it’s probably fine when your testers are otherwise bathing regularly and not in an emergency situation. Someone in the field using these in place of a bath, however, should not mimic your testing method but should follow sanitary order for hygiene/health purposes.
Great informative post! Something stuck out to me, however: “Each wipe-shower started on the left foot and followed the same path and method across the body.” This is fine for testing, but normally when using the same wipe over multiple body parts it makes sense to follow the same sanitary order as sponge bathing and go from more sanitary areas to less sanitary areas: something like face, then underarms, then groin, buttocks, and finally feet at the very end.