Hi ! swirl marks over time will always be an issue with dark colours especially like mine black sapphire! I have just purchased some new detailing swirl remover, cost a small fortune, have yet to try it but the results I have seen have been excellent. The only way is to have a good layer of carnuaba wax and I use a detailer with micro-fibre cloth in between washes........will try to update when I have used the new swirl remover.....
The upside is no other colour looks as good as black when first done!!! wish it would last!!!
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