Maintaining clean car interior is to prevent trash. Get into the habit of carrying a small trash bag or container, and make it a rule to dispose of trash immediately.

Maximize the space in your car by using organizational accessories such as car organizers, seatback pockets, and storage bins.

Dust, dirt can accumulate quickly inside your car. Invest in a portable car vacuum cleaner to make regular cleaning easier.

Use microfiber cloths or car interior wipes to clean and wipe down the dashboard, steering wheel, gear shift, and other hard surfaces regularly. 

Maintain a fresh and pleasant ambiance inside your car by using air fresheners or odor absorbers.

Preserve the appearance of your car's upholstery by using seat covers or seat protectors.

If you must have food or beverages in the car, use spill-proof containers and cup holders. Always clean up any spills immediately to prevent stains and unwanted odors.