never. I still have competitors around here that whip out that big ole' 10', 2' hose, and let the tank rip right down the driveway. Then they go scrape up the lint and crap and hose it down a bit. That waste cleaning water does a job on discoloring a new, nicely sealed blacktop driveways. I use the APO, discreetly or into the custys sanitary. Never dump directly from the waste tank on custys property. Professional courtesy.
And.....everyone has a cell phone camera nowadays.