Question: how to get your car back to showroom condition?
Answer: Protecting the Paint–Clean, Polish Protect.
Tires. Many products on the market, such as Autoglym's Tyre Dressing, are designed to seal your wheels and restore their black appearance back to looking like new. ... 
Interior. A thorough vacuuming is the key here, as shampooing can only do so much to get rid of grime. ... 
Glass.