There are a lot of waxes that will provide some swirl-filling capabilities. But they're temporary. Anything with silicone in it will help some, but don't expect it to last for more than a couple washes / rains.
When mine gets swirled - and I don't have time to polish- I'll WOWO some s100 and it helps some. Doesn't hide them completely but softens the edges so they're not as noticeable.
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