It's another tar-cleaning mission. This time, you have to clear Reapers off the rooftops and then blow up their kegs of tar on the water towers. Find the first infected water tower just south of your starting point. If you circle around to the west and climb the building next door, you can get a height advantage. Once the Reapers are down, recharge yourself and climb the water tower. Use Shockwave to destroy the keg and douse yourself with tar, then prepare to run and fight as best you can because more Reapers are coming.
As you play this mission, you'll notice sick civvies on the roofs. If you heal them, they will start attacking you. They don't do a lot of damage, but they can interfere while you're trying to shoot it out with Reapers, and if you get several together on the same roof they can gang up on you pretty effectively. In short, leave the sick pedestrians alone.
Tar kegs 2–4[edit]
Find the second tower, which is not quite as closely guarded as the first. Heroes will use Shockwave and take the hit themselves. Infamous players will overcharge the keg, which renders it useless and poisons the people using the tower. The third tower is right next door to the second, and is only guarded by a couple of Reapers.
Tower number four is across the train tracks to the west. First, you need to dispose of the RPG on the roof directly across the tracks. Use Shockwave to deflect the rockets and shoot him in between. Once he's gone, do not cross to that roof. Instead, look to the higher building to the left.
Jump down to one of the beams crossing the track and run over to that building. Climb to the top and hang off the edge. Shimmy over to the left and take out the Reapers to the south. You can then get up on the roof and use the cover up there to trade shots with the Reapers to the north, on top of your target building. Look for a propane tank at the corner of the building. Blow it up and you can probably get one or two Reapers in the blast.
The last keg[edit]
The fifth tar keg is to the south and appears to be lightly guarded. Do not let appearances deceive you. Take out the lone Reaper running around on the roof, but do not just jump up on the roof. There's a machine gun up there. As you approach from the north, you'll be on a lower building. Shoot the Reapers that are in sight, then knock down the crane at the west end of the target building. There's another crane on your roof. Knock it down, cross to the rope hanging from the higher crane and climb up. Do not put yourself in full view of the turret! Target the propane tank next to the turret and blast it to take out the remaining Reaper manning the machine gun. Your way is then clear to disable the final tar tank.
After the cutscene, congratulate yourself on a job well done. You'll soon begin seeing Dark Water side missions crop up. These side missions have the same objective, though only one keg has to be destroyed. You also get the same Karma Moment.
For now, the story sends you back to Zeke's roof for some conspiracy theory chit-chat. Going back to Zeke's pad will automatically send you into the next story mission, so don't go if you still want to do some side missions.