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Machine polisher.
Can have a go by hand is hard going, and impossible more or less on German cars.
Another way is to try and hide with fillers from polishes and waxes, depending how bad.
To be fair there are alot better products to use other than the Farecla but it is all dependant on how much you want to spend or what equipment you have.
As C4llyT has said by hand it will be near on impossible to remove them permanently