I normally swab every2 orso shots depending on how dirty it gets to load. I use TC's bore cleaner and run a wet followed by a dry patch. Make sure you only run wet patches through first or you won't be able to get it back out. Here's a tip. If you do get it stuck, pour some solvent down the barrel and it will come out. I had to get several stuck beforeI found that out.

For the record,I have loaded my ML 30 times without swabbing and haven't had problems. It will affect accuracy and loading to not swab but it's not mandatory. Just thought I'd let you know.