let them (esc, receiver and servo) sit and dry for a few days, take the buggy apart and clean the old grease, add new grease. Then remove the bearings and follow the instructions I just gave you... then put them back together and that's it!
But I think your ESC likely is totalled.. the receiver and servo "might" have a chance to servive... try them after a few days of drying man... good luck...