If doing mud, the most common cause of overheating isn't sensors clogging (They don't clog) its the radiator getting clogged (They DO clog).
Sensors can get WET, but that's a temporary issue....but the mud needs to be cleaned out of the radiator fins before it hardens to an adobe-like cement in there, blocking airflow. With less air going through the radiator, there's less air to carry off the heat its supposed to radiate away, etc.
You would also open your air box and distributor and see if they're dry...and, if not, dry out your air filter/box, dizzy, etc.
Your alternator is very vulnerable, and cleaning it out is vital too. If you get it clean, then spray its guts/wiring thoroughly with Si spray to help the next batch of goo slough off instead of sticking. They are not that hard ot take out, clean, and put back if the brushes, etc, are really effed up with crud...about a 45 minute project. Spraying ALL of your wiring, fuses, etc, with that Si spray also helps to keep them cleaner and drier....with fewer dash lights, etc.