You can send Walther CS an email. I had contacted them when my PPQ trigger return spring failed and they sent me a replacement with a spare (occurred at 12k rounds for those curious).
Taking the PPQ apart is no more difficult than a Glock or any other striker fired gun. You should be able to do it with help from YouTube and a few punches as Stu already said.
Is that the way some people do it? I guess that would get pretty tiresome. I use a wire scoop to dig out the brass, 95% of the media falls away, then I dump it into a strainer until it's full, and then shake out the rest of the media. That gets out 99%. Lastly, as I inspect each case, I tap out the last few bits that may remain. There are tumblers that look like BINGO ball cage, to shake out every last bit of media too. I don't mind tapping the cases as I inspect them before I toss them into the deprime/reloading bucket.