I'm new to reloading and I'm considering the purchase of a brass cleaner (among other toys ). I have collected a lot of pistol brass that I can use to reload. I have a couple of questions to those more experienced reloaders: 1) How critical is it to clean your brass before reloading? I've heard different opinions on this. 2) What's your take on a tumbler-type versus ultrasonic (e.g., Hornady Lock-N-Load® Sonic Cleaner 2L)? Thanks in advance for any input you can provide.