Possibly the most common, and maybe the easiest car maintenance job is to wash the car! Often looked on as a cosmetic thing it does have other significant benefits which should not be ignored:
1 Going over the whole car with a sponge or a leather gives you the chance to spot issues that otherwise may go below your radar, eg windscreen wipers splitting, window rubbers fatigueing, dinks that will rust if left untouched etc.
2 Removing the surface grime will also help prevent the ingress of nasties into the parts of the car where they may cause rot and decay.
3 An opportunity to check the tyre condition and tread depths
4 The feeling of satisfaction and possibly even pride when you finish the task and step back and admire the results of your work.
Why am I posting this you ask? Well it's simple, I am feeling that warm glow having just completed the task on my MX3 !

- Own work