Step 6: Serve taters.
Step 7: Assure guests that that soapy taste is just their imagination.
Step 8: Remind masher to rinse hooves more thoroughly next time.
…also. if there be any foodies or home cooking hobbyists reading this, old food chemist’s trick for creamier mashed potatoes: add a dollop of sour cream instead of milk, then use an electric mixer to whip air into the potato mixture. :D also, try white pepper and a tiny bit of garlic in your mashed taters some time.