Hang a trash bag - even if you do not eat inside, there is always some junk and useless stuff. Hanging a remove bag on the back of your seat would be a very wise solution to this problem. You can use it for papers, water bottles and all the other trash that may be acquired there. At the end of the week, you just take the bag out and throw it away. It is that easy!
Do not eat inside - unfortunately a lot of people have this bad habit. Eating inside is one of the most unpleasant things you can do in your car. You might throw out the wrappers immediately, but that would not help a lot. Just think about all the crumbs and stains that may be left behind. If you want to keep the interior clean and shining, you'd better avoid this action.
Wash your floor mats regularly - even if you follow the last advice, you cannot fully protect the floor mats from getting dirty. But there is an easy way to clean them. First a little vacuuming to take away the big chunks. Then you scrub the mats with soap and water and let them dry. Follow this scheme regularly and you will manage to maintain them neat and clean.
Knock your shoes before getting in - of course, you cannot get in your car with completely clean shoes, especially when it rains or snows outside. But you might do a little trick to reduce the dirt. Just sit down on the seat with your legs outside. Then knock your feet together. That should at least free the footwells from some spoils and grime.
Keep your car in a garage - if your car stays outside all the time, it will need a proper cleaning a lot more frequently. Keeping it in the garage is the best way to protect it from all the dirt that Mother Nature can bring. And if you do not have a garage, just try to find some enclosed space. It will help a lot for the outlook of your vehicle.
These are the recommendations for maintaining a clean and nice-looking car. Try to follow them and you will quickly notice the positive effect. Of course, in case of a real mess or car damage (it happens to everyone), you can always call professional mobile car valeting service. Just think about what will be the best option for your car and take all the necessary measures.