Internal Cable rattle

One of my most favourit things about riding on the country lanes is how quiet it can be, however I have a 2008 Focus Cayo, with the brake cable(could be gear cable, can't remember off hand) routed through the top tube. This rattles, and it's really annoying.
It also makes me think there is a problem with the bike when there isn't, so has anyone else had a similar problem, and had a simple non-damaging way to silence it - an extreme solution would be a nice squirt of expansion foam, but I can't imagine that being any good for the frame, or particularly easy to remove when I replace cables.
It also makes me think there is a problem with the bike when there isn't, so has anyone else had a similar problem, and had a simple non-damaging way to silence it - an extreme solution would be a nice squirt of expansion foam, but I can't imagine that being any good for the frame, or particularly easy to remove when I replace cables.
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Bizango 29er