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I agree with Kevin. Daytime observation of the Moon is dreadful, and gets worse as the Moon's phase fills out. The sky is just too bright, competing with the Moon for contrast. Focus becomes really, really difficult. If you've used your scope before, AND it focused then, it ain't gonna change now. But under daytime conditions, a filter won't help. Except maybe a yellow filter as this will improve contrast a small amount, but you end up with a yellow image.
The only time I use a filter with the Moon is when I'm viewing it under low magnification instances (during the night too). Under high magnification, I find I don't need a filter. The filter I use is dual polarising filters so I can control the through-put of light.
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