save yourself a lot of money on fancy polishes, i use Johnsons Pledge multi surface polish, or Mr Sheen multi surface polish, they are both aerosols and approx £1 to buy at the local supermarket, they are both NON ABRASIVE so can not harm the paintwork and also any tar or residue just spray it on to the bodywork and leave it for a minute or two and it will dissolve, i dont use it on the windscreen on that, i use warm water and a washleather and a crumpled newspaper page to dry the screen, i have just purchased a mini one and will be using it on all the exterior surfaces including plastics Not Windows or screens, i was given this tip a longtime ago and i can assure you my vehicles have been well admired. give it a try if you dont like it you are not left with a tin of overpriced polish.
try it on a section of your roof see what you think.
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