Use lukewarm rather than cold water along with your mild detergent option, with enough held in a large bowl or basin to submerge your shoes or boots if you want to clean the inners as well as the outers. After cleaning, lie both shoes upside down with tongue out over an absorbent cloth to air dry. Once fully dry, test the waterproofing and reapply DWR if water does not bead up and run off of each shoe’s outer.