That's the main thing... And that's an "issue" with all pistols, really.
Some would suggest a mag or two of jacketed ammo for every couple hundred rounds of lead. Thought being that the jacketed ammo would serve to help "scrub" / wipe the residue out before it got too thick to cause pressure issues. I have no idea if this principle is true or not, however.
Not to sound like I miss treat my Beretta's but I've run a lot of lead rounds down the pipe and then run some jacketed stuff and I haven't ever had a problem... Cleaning them is something I do after they get muddy or maybe out in the snow and rain etc. Not very often otherwise and they always go bang when I use them...
Be careful if they're reloads. I fired some through my 92 and the back of the casing and blew the trigger connector spring out of position. Also shot these in a ruger and didn't have an issue. Not sure what caused it, but I had to tear down and reconnect the triggef when I was done. Never had any other problems and haven't shot reloads in anything since.