I dropped my car remote in the toilet

Call the plumber. If you haven't flushed it yet, wear gloves and try reaching in.

When you get it out. Disassemble. Wash in clean water. Dry the best you can. Place in a ziploc bag of rice for a few days.

Might not work right even after being dried out. Probably will need to get a new one. Hope it's not too expensive an item at your dealer.