i had my car painted 2 pack clear over metallic 3 years ago. from its first wash it received a kerosene wash every few months, it works great, i learnt it from when i used to work washing buses, i always had to wash the buses with kero. I never had a problem with it damaging anything ever,
i spray it on with a spray bottle after then wipe the car with a rag then rinse off, sometimes i used to wash the car with normal car wash afterwards, but no need to really.