There's a veteran poster over on autopia.org who claims to get none to almost no swirls. His name is accumulator. He has a detailed wash process posted.
I've read several coats of Z5 help. I have werkstatt sealant and don't like it. Everyone says it's spray on KSG, but I don't see it sheeting like ksg does.
Lastly, you can try glazes to cover the swirls.
Personally, I have a pressure washer and just ordered cr spotless. I have carbon black. Strangely enough, it's easy to marr but difficult to polish
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