As far as cleaning, even the substitutes like Triple 7 will cause rust.
I had inadvertently left a revolver for awhile, after using 777, and it rusted.
For wads between powder and bullet, I've been using thick auto gasket material, cut slightly oversize with a hole punch.
Even without any lube, they seem to work just fine.
No surprises, so far.
Lock the doors, they're coming in the windows.