I would recommend for anyone to buy a citrus pre wash from one of the car care companies. it would help significantly to remove most of the dirt before washing the car with a bucket and mitt.
I like using autobrite direct citrus pre wash. It can be diluted down to something like 100-1 which means a 1L bottle can last a long time.
If you sprayed a layer of citrus over the whole car, let it sit for a few minutes, then power wash off, it would make car cleaning a doddle.
And also reduces the risk of getting swirl marks in your paint.
Hope that helps.
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