Start with Part 1
Deep clean the mats and upholstery
You can usually find a carpet-cleaning machine for very cheap and it's essential you use one to clean your car like a pro. It sprays water and chemical cleaner onto the fabric, then sucks up all the grime back into the machine. If you're wary of purchasing a carpet-cleaner, see if you can rent one or borrow from a friend instead.
"Detail" all corners of your car
No need for industry-standard equipment when getting into the nooks and crannies of your vehicle. Simply wrap a fine cloth with cleaning agent to the end of a screwdriver and wipe down all the crevices of your car's interior. Pay particular attention to air vents, radio dials and dirty edges along the cup holders. Afterwards, use a shining agent like Armor All along the dashboard and trim to get that luxurious sheen.
Question to the Reader: What is your favorite car wash in town?