My two cents -
TURN OFF THE CIRCUT BREAKER TO THE AC UNIT BEFORE REMOVING THE COVER. There are wires with 110 VAC under there and there are moving parts if the unit comes on while the cover is off that may hurt you.
Just inspect and GENTLY clean the condenser coil and the "in the weather" part of the unit (red on the diagram below). You can take off the plastic outer cover to get more access. Use ONLY a GENTLE stream of water. You may find fins bent to where the air spaces between them are blocked. If only a small % is blocked leave them alone. If more use a fin straighner tool or hire professional to address it, if you don't use a fin straightener right you will make it worse. Don't even think of trying to use anything BUT a fin straighner on the coils! DO NOT use any sort of high pressure spray nozzile directed at the fins, they are VERY easy to flatten and block the air flow, in which case you will be far worse then you are now with slightly dirty fins.
The most beneficial thing you can do is remove any wasp's nests and other insect or birds nests you may find that restrict air flow or have potential to get into the blower. Use a gentle stream of water to rince out any dirt you find. Use Dawn or mild detergent if you see any greasy build up. If you do make sure you get it flushed out of the condensor coil very well.
Just like we never take apart the plenum above our furnaces or the innards of our cars and truck and try to clean the evaporator part of the AC and we don't pay professionals to do this for us either, don't try to take off the sealed evaporator compartment cover and clean the evaporator part of your RV AC. You likely will lose the airtight seal and watertight seal in the process and create new problems. That area generally never needs to be cleaned for the life of the unit unless it develops a coolant leak there and has to be repaired or the blower bearings fail, both very rare.. The exception may be if some one removed the inside air filters and never put them back.
Good luck,