There are several Branson members here that have "gutted" their canister. Hopefully one will be along with a detailed explanation of what they did. I think all you need to do is open it up and take out the screens, but since I went a different way, I can't speak from experience there. I do know from talking to my own dealer at the time, that if I brought it in, it would be covered under my warranty for either cleaning or replacing. I think my dealer said he would have ordered a new one to put in my tractor, sent my old one off to be cleaned, and then kept my old one as a future replacement for someone else if needed.
By then I had pretty much made up my mind to delete mine, so I never did take him up on it. But if you're tractor is still under warranty, I'd call your dealer and let him "deal" with it.