Above is a link to the Techinfo article about how to do this.
To answer your question, yes it can be cleaned by removing the air intake. But there'* a honeycomb over the metal opening that'* a real bear to get out without distorting it.
Only the throttle body needs to come off the end of the UIM. Remove the sensors that are in it like they suggest in the Techninfo.
A new gasket for the END of the UIM between it and the throttle body is what I would put on. They're available separately.
I tried doing this through the end of the throttle body and damaged a couple of fins on the honeycomb trying to pull it out with paperclips. It'* a force fit.
One time I was able toclean the inside with a soft cloth on a wood stick and intake cleaner spray on the cloth. Another time it didn't make much difference for very long.
The real cure is to take it off and thoroughly clean. That will fix it for another 80K miles.