-choose where you park (preferably next to a post usually and away from where the people pass like doorways, etc.) - detail/waxing regularly (i.e. once a month) goes a long way in keeping the shine and minimizes the visible scratches. What color is your ride?
- keep the engine and interior clean
- get a good car wash at least once a week (use the proper materials as others mentioned)
- don't smoke inside the car
- don't put an air freshener
- follow the preventive maintainance schedule
- don't let too many drivers or other people drive your car. As much as possible, kung ikaw lang nag drive then better.