Well, it's not really hard to clean the intake anyway. Once it's off, take it all apart. I would highly suggest having an extra set of gaskets around 'just in case'. Also, have, at the minimum, 8 cans of Berryman's B12 Chem-Tool. You will need all of it. Trust me.
After you've got everything apart, soak it with some Berryman's and let it sit for a little bit. Then just go at it with a small brush. Something like a toilet brush, but smaller, usually works great. I believe I may have even used a toilet brush on the tanks, because those are larger and easier to manuever the large brush around in. On the runners, a baby bottle brush works well. Said bottle brush will work pretty well on the end tank as well.
The thing to remember is that it takes a bit of time and a lot of elbow grease. Once you clean it out, though, you should notice a difference. I know I sure did. This was on my then-115k mile engine that had never been opened to my knowledge.
Nobody that I know of cleans them, although that doesn't rule out some local shop that would probably charge you an arm and a leg to do it. It really is a straightforward and simple task. While you are in there, you may as well pull your valve covers and replace the plug well seals and valve cover gaskets as well. And then, since you're that far already, you might as well do the top end 60k. If you want more info, search for 60k info. Alternatively, you could check out JDLangevin's SHO Maintenance page, found
here.