Damn. I've been using my Vrod almost every day since I got it several months ago (January), and I've never had to even remove the screen yet. It's still quite clean.
I never have felt the need to stir, so I'm not helping to clog the screen by doing that.
When I finish a bowl, I use the debowler spike in my NV stand to empty the bowl, then I blow in it, then I brush it out with a small brush (an MFLB brush), and the screen is clean.
If the screen weren't to come out clean, it would be because I didn't fully extract my herb...and my fully extracted herb is never black. It's usually a medium brown.
Here's my shovelhead bowl with that original screen that I've never removed in the last few months of almost daily use with all sorts of different kinds of cannabis. All I've done is brush it out after every bowl, and not one spot in the weave is clogged. The key is to fully extract before dumping:
**Edit** - Actually, I just checked, and I was wrong. it's actually been about a year since I've had my Flowerpot setup. And the screen is still clean.