Try to insert the drive in rice, I read that the rice absorbs the moisture, but the problem is the oxide in some mechanical parts, if you apply heat in the drive some parts for example plastic and the headers that are plastic will can suffer damages. When the moisture will disappear you don't forget to lubricate the mechanical parts, oil and fat without graphite, also you don't forget the electric part as the motor and some circuited that could suffer damage, but never give heat. And other option to rice is some product that absorbs the moisture as the little bags that are in some products, but as with the rice you must clean the parts with air and brush to quit the rice, etc. and after to lubricate with care.
