Here is what I normally do after a day of bashing (Normally but I have skipped out a few times)
Remove the following and brush and/or spray clean
Body: Spray with DA and wipe off
Wheels/tires: depending on the grime, spray with DA on the rims and wipe of mud/dirt rspecially on the hexes.
Radio Tray: I clear out the RX, and battery so there is no crap in there to hurt my gear. For my 1/8th scale I like to wipe it down with WD-40. Gives it the new look. WD-40 is great on drive trains to protect from rust and corrosion.Just blow off the excess with an air compressor.
Fuel Tank: Clear out the fuel from there so there is none left. Leftover fuwl can gum up the lines and the stone filter if you have one in your tank.I like to leave this clean so the next time I fuel up there is no debris that can fall in there.
Tranny:Simple, 1/8th scale buggy I just spray em down and check for leaks.Rebuild if necessary. MT trannies: I just make sure there is no binding or cracks on the case. spray this down with WD-40 and blow off excess.
Engine: Remove the air filter and cap the venturi opening with a rubber boot. Remove the exhaust and cap with a rubber boot as well.I clean the exterior with DA and an old toothbrush.I don't spray the engine with WD-40 with fear of the rubber boot on the carb wearing out. When this finished I drop 2-4 drops of After run oil and cycle the engine manually, a few tugs on the pullstart or turn the flywheel a few times.
I remove these mainly to get a clean view of the chassis so there is no dirt or mud build up.
Other things I do is to look at the air filter and boot and see if there is dirt build up or the foam needs to be cleaned and re-oiled. Use air filter oil NOT after run oil. I normally soak it and let it sit in it for a while or just leave it in the bag till I go out bashing. Don't oil the pre filter or the big one that covers the main filter.
Check fittings like zip ties on exhausts if you use a rubber coupler and the gasket to the engine. Users with one piece pipes check the gasket for wear and springs for worn out ones. Replace these if they are loose and have little tension.
Recharge the RX if you use a rechargeable pack or replace Alkalines as needed.
The exhaust I would just use an air compressor and clear it out. This is not that necessary unless you just are not cleaning out your ride at all. Just make sure you point the stinger away from you and anyone else when you blow it out.
Did I miss anything?