[sgc]

I don't try to clean myself with my toilet seat. It might "self clean" with water, but that is far from sterile. And yes of course a sink used to wash after using the toilet is dirty, as are the towels used to dry your hands. After a year of a pandemic, we should know that none of this is perfect. As in many cultures, we use separate towels for hand wiping and face wiping for this very reason.