I presume you have had his urinary tract health checked out. Male cats, especially neutered ones, are very prone to this. And one of the signs is peeing in strange places, like the bathtub or sink.
Just a thought. I lost a young male that way once.
Wendy ------ Booked: Uniworld Egypt, 2015 Tauck Amsterdam to Budapest, 2016 Paul Gauguin, Societies & Tuamotus 2016
🚢 Cruise with your favorite Keene Luxury Travel Staff Member! 💰 5% KLT Reward plus Shipboard Credit available (amount varies per voyage)! 💲 Offering Enhanced KLT Rewards on voyages hosted by Ngaire & Clay!