Compressed air, Blow everything off, Check the tires. If nitro check reciver packs, and fuel. If electric check all connections, change batteries.........
+1 on the servo thing I almost cried when i turned it on and i didn't get the comforting beeping of my 5997tg...
But yeah I do the same as LosiLST just blow it off and clean the tuff spots with simple green check my screws charge it all up.. Also i throw some wd-40 on the pivot balls and cvd cups
Those things have never been near the pressure I've needed to get track clay off my rig. + the freezing air out of those things can potentially harm your rig if used improperly.
If I'm at home I normally take the body off too and dip it in hot, soapy water. Then give it a once over with a rag. But like everyone else eaid. COmpressed air, simple green or nitro cleaner, and check your vitals (batteries, servo's, recievers, linkage, fuel).