I like to engage all my senses during my shave. See it come off while shaving in mirror. Wiping with stropping motion on paper towel allows me to see total volume of whiskers removed per pass. By third pass , feeling of face and seeing evidence of facial exfoliation because its only skin tells me there is no closer to get. All my barbers since I was a kid till now always wiped off blade on papertowel draped over their non dominate forearm. Around here we called it tightening up the haircut, because they started at one sideburn and worked every inch around back till they arrived at the opposite sideburn.