Pour a modest amount of a quaternary ammonium-based disinfectant/cleaner onto a bowl swab and run it over the top and underside of the seat.
Leave the seat upright while you swab out the bowl and trap. Let it all sit for five to 10 minutes while you clean the sink, mirror, etc.
Wipe the seat clean with ...
— Lynn E. Krafft, ICAN/ATEX associate editor, email@example.com.