Finally, clean or shampoo the seats. Cleaning the seats is essential for a good detail. But different seats require different methods. Note that after cleaning, you may have to vacuum out the seats or surrounding area again, as dirt will be loosened up by this process. Condition your leather seats, if necessary. If you've cleaned leather seats with product, now's the time to condition them so that the leather looks visually appealing and doesn't dry out or begin to crack. And use spray glass cleaner on windows and mirrors and wipe clean.