I've got halfords own brand polish?

When you polish does it make a very subtle difference or a big one ? I have a old Audi a3 10 plate and the body work is very chalky and dull also on the driver doors there are white stains or chip but the look more like smudges but its paint damage I !!!! I have simonoz color restore polish is that useful or do I... show more When you polish does it make a very subtle difference or a big one ?
I have a old Audi a3 10 plate and the body work is very chalky and dull also on the driver doors there are white stains or chip but the look more like smudges but its paint damage I !!!! I have simonoz color restore polish is that useful or do I need to clay bar the area first?
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