I forgot, "3M Prep & Blend Liquid" is really good with an old bit of scotch brite. It's like a mildly abrasive paste, it makes things more even too. But unless you work in a body shop painting cars all day you're not likely to have any laying about... It's about £19 a bottle so not worth buying... I don't know if you can get an equivalent to it in small quantities that's cost effective for you ?
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