To clean windows without any expensive cleaning agents, use a solution of half water and half vinegar and wipe windows down with newspaper. This will leave your windows with a streak free shine. You may also use a paper coffee filter. This does not streak your windows.
Never use damp cloth on car seats. It will make the leather's condition becomes worse.
To help keep your car clean, use little trash bags that hang on the back of your chair.
Rather than using expensive car shampoo, you can use any shampoo to wash your car, it will cut 2/3 of you budget.
Vacuum the seats and the rest of the car interior in preparation.
Once you have finished vacuuming, apply sparing amounts of your car upholstery cleaner as directed on the packaging.
Carefully wipe down the seats with a moist chamois, taking care to make sure that the cleaning agent is entirely removed.
Allow the seats to dry naturally, making sure that no soap spots or stains have been left behind.