Good points Jelmer. I forgot to mention using the 'T-Cut' first, followed by toothpaste, then a soft cloth/cotton wool. A cotton bud can be used for reaching inside the cone, or a piece of cotton wool wrapped around the point of a toothpick. Problem with toothpaste, in confined spaces, is it's a b*gg*er to clean out, even after washing, as it can set and then dry, showing up later. Always wash, wash more, then wash again, after using the toothpaste!
A coat of Future when finished will probably make any small imperfections disappear.