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"Moon" filter can mean several things. The ones that come included with cheap scopes are a dark green filter. You get a visually not all that satisfying very green Moon to look at.
A better one to use is a so called "neutral density" or ND filter, which just cuts down on the amount of light evenly across all colours. ND filters have a rating which specifies by how much they reduce brightness (see wikiped page).
A better option still to use crossed polarisers (they are sold as a single filter, not expensive) where you can adjust how bright or dim an image you want.
But IMHO the best option is to use no filter at all and view the Moon in its first or last quarter if you want to see maximum detail. (For showing others the more-than-half-full Moon an ND-filter can be useful though.)
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