its not to be used on exterior paint, only for grease, embedded dirt, oil stains etc, it's also pretty strong is not suitable for use anywhere in interior
btw if engine is not too dirty you can get carpex APC from hyper star lahore
You can use APC on interior trim or seats to get rid of embedded dirt but also can't be used on paint, it works good and is satisfactory for the price. If engine bay not too dirty or has oil stains then might as wel try APC which can also be used else where