Using petrol/diesel to remove very tough stains can be ok, as thats quite the only way out. But for simple stains, its better to stay away from such method. Though using other methods may be tough, its easy on the paint surface. Stains such as tar, paint etc can be removed using diesel. As far as possible, the cleaning agent must be applied to the stain area carefully and not just rub the entire surrounding.
There are many threads related to washing waxing. Do search for them. In the meantime, here are some points:
1. The dullness is usually and mainly due to swirl marks. To avoid swirls, you must wash the car using very soft material and ensure mud and other solid particles are not present on the surface. Obviously by now your car will be filled with some amount of swirls. But to avoid it becoming very serious, you must take care while washing from now on.
2. Professional detailing once in around 18 months will keep the car looking new. Also, waxing once in one or two months will retain the detailing effect.
Where there is a wheel, there is a way!
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