First of all i am not a hand gun person ?
My daughter-in-law brought me her S&W to clean for her .
I have it field striped and understand how to clean & lube it but there is powder residue [ like gray dust] in where the magazine comes up through and to the rear of it where the trigger parts are !
This part of the gun is plastic? How do you get this area clean ? Can it be sprayed with some thing and flushed out ?
I go to town on everything with q-tips, and a little cleaner on them. Pretty sure I remember the book saying not to take it apart any farther, and I'm not about to soak the trigger assembly with the plastic/polymer grips, etc. maybe someone else can chime in, but I've never had any problems doing it this way. I go through probably 20 each cleaning
I've always used good old Hoppes no.9 on a patch with one of those green nylon tooth brush looking things. Wrap the patch around the bristles and just run it up and down the mag well/hand grip. Then follow with a dry patch to remove any excess. Have never had any issues.