I spilt petrol in my car - what can I use to get rid of the smell?

I spilt a bottle of petrol in the boot of my car three weeks ago. Despite cleaning with shampoo, I still cannot get rid of the smell. Can you advise of any product I could use?

What would you recommend for cleaning light-coloured fabric upholstery?

What cleaner/shampoo would you recommend for cleaning seatbelts and light-coloured fabric upholstery?

How can I remove scratches from the piano black trim in my car?

Some new cars have very high gloss plastic interior/exterior trims, often referred to as "piano finish". My Mercedes has both interior and exterior such trims. What is the best way/product to remove scratches...