Dry with a paper towel(s). I use terry towels so I don’t waste so much paper. The manual states that the grill plate is dishwasher safe, but since the heating element is also connected to the grill plate, I don’t want to take that chance and ruin the grill (Remember: Generally water and appliances is a HUGE NO-NO)
https://www.amazon.com/Wolfgang-Puck-Electric-Reversible-Griddle/dp/B001ANXQQ6