Completing The Clean Dream quest in Arc Raiders is surprisingly tricky, especially if you don't recall how to find the underground tunnels on Spaceport and never did the Switching the Supply quest that takes you there. Beyond simply finding the tunnels, you'll also have to track down the Filtration System down there.
Once that's done, you're heading to Blue Gate to find a Purification System in a bunker as well, so this quest is fairly long, necessitating two runs as it does. I'll walk you through all the steps to finish it below. If you don't want to risk gear, this is definitely a good quest for a free loadout, since you don't have to extract anything valuable.
