Merrily Go Round Achievement in PowerWash Simulator

Quite simply do the Carousel level WITHOUT hitting the stop button on the side, and this one is yours. That's all there really is to it. I found that if you activated the auto-water, and just stayed in various spots, you could quite easily clean the moving parts with little to no issue. For the rest: get on the moving platformn (and do the same) and then use the scaffolding for the top and higher bits. Do that and you'll get this after a bit of time, for sure! Turn it off though and you void the achievement - even by accident - and you'll then have to redo it in Free Play. No one wants that!