Do yourself a favor and get a k and n at autozone for $35 or so. I think the number is hd 0800. Do a forum search, I think you know how. When I replaced my SE a/f with the k and n there was a nocticable difference in the way the bike ran...
If you have the blue SE filter chuck that chit out the window and get a K&N if its the other one, yes it is washable. Use the K&N cleaning kit and you will be fine. As Anubisss said, the K&N filters are made better though.
The blue and the black paper elements that come with the HD SE air filter are both cheap crap and have a tendency to come apart.
I didn't waste any time replacing mine with a K&N HD-0800 filter.
Tom
Is this the right filter? The part number for the SE A/C Kit it references in the add does not match the part number for my SE A/C kit. But mine is 3 years old so maybe the part number changed. Any ideas?