Welcome to the forum Ginny!
Your best bet is to NOT power it on for some time. Grab a gallon ziploc bag and throw a handful or two of uncooked rice in there. Then place the transformer on top of it for a few days. This will help dry it out.
If you are OK with taking it apart, taking the bezel and the back off would help. Here is a guide on how to get the bezel off and back on without any damage. Taking the plastic back off is a piece of cake as it has one screw in each corner and then three on top and three on the bottom and it is off. This will help it dry much faster in the bag of rice.
If you do take it apart, be sure to not get rice all inside the components as it may be hard to fish out.