In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Petrol
If you smell petrol in your dream, then expect upsetting problems at work. If, however, you are cleaning your clothes with petrol, this means that, after much effort, you will succeed in your career.