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doh I tried posting this and then the site had a hiccup for a bit.
You need a neutral density filter - the coloured ones will probably work a bit, but the ND ones would block out more of the right wavelength I assume.
If you want to spend a bit more, you can get a variable polarising filter, which lets you "tune in" the amount of light reduction you want, from something like 9% to 30% I think.
Also remember that any filter is going to reduce detail, even if it's only a slight amount. But I suppose if you're looking at the full moon it's not going to make that much difference in detail.
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