I had a Toto washlet installed on a toilet for around 15 months. When I uninstalled it, I was prepared for the worst, but it was fine underneath. You just clean

I had a Toto washlet installed on a toilet for around 15 months. When I uninstalled it, I was prepared for the worst, but it was fine underneath. You just clean the seat and lid like any other toilet, with paper towels and some kind of spray cleaner, it's fine.