It depends very much on the driver. Some driver will strip down their car/engine into million pieces and re-assemble them after a day of running. Some will throw the car into the coner and dig it out next week before he go to the track.
For me, as long as the drive train is smooth and engine is working fine, I will not do extra works. Basically, after a day of running, I'll put after run oil in the engine, clean the car with air blower in the track. Before each day of running, I'll check and setup the car. I'll also strip down the car/engine once several months to check for wear and replace necessary parts.