The control wheel in the Sewer Room is similar to the three outside that raise and lower the water levels. Except that this one (at the far upper right, past the rats) dumps sludge on Ratman and scares away the biting flies. You still have to get past them and jump over to where Ratman is, to capture him.
(see related question)
Defeating him has nothing to do with milk. There is no milk to be found anywhere on Super Power island.
Turn the red wheel on top of the last ledge.
When you face ratman and his rats and flies, climb to the red wheel at the upper right, which will dump sludge on Ratman. Jump quickly between the rats. Then avoid his flies to jump over to him and cuff him.
You have to make a series of three jumps between the rats to reach the red wheel at the upper right (to dump the sludge on Ratman). Then evade the flies and jump from the middle raised pipe over to cuff Ratman.
Once you enter the control room, climb past the rats at right to reach the final red control wheel. This will dump sludge on Ratman and the flies will attack you. Dodge them until you can jump to the large center pipe, and then to Ratman.
There are three red wheels that lower and raise the water in the sewer. But the one you use in the Control Room is at the upper right, and you have to jump past three rats to reach it.
Ratman is hiding in the sewer with his loyal rats and stinging flies. To defeat him, you have to get past them.The procedure :Find Ratman in the sewer. Enter the public restrooms near the park. Go down into the drain.Go left and lower the water level at the control valve (red wheel). Go to the right and raise the water with the second red wheel. Swim past the pipe at left to reach the control room door.When you find Ratman, go to the right and jump past his rats to reach the upper control wheel. This will dump water on Ratman and disturb the flies.Dodge the flies and go left, jump over to Ratman and knock him out.Arrest him with the special Anti Power Handcuffs
Ratman is hiding in the sewer with his loyal rats and stinging flies. To defeat him, you have to get past them.The procedure :Find Ratman in the sewer. Enter the public restrooms near the park. Go down into the drain.Go left and lower the water level at the control valve (red wheel). Go to the right and raise the water with the second red wheel (if you miss it, use the third red wheel at far right, which also raises the level a bit). Swim past the pipe at left to reach the control room door.When you find Ratman, go to the right and jump past his rats to reach the upper red control wheel. This will dump sludge on Ratman and disturb the flies.Dodge the flies and jump up left (onto the large pipe). Then jump over to Ratman and knock him out.Arrest him with the special Anti Power Handcuffs.
Ratman is hiding in the sewer under City Park, with his pet rats and stinging flies.
Ratman is on Super Power Island. There is a large rat in the sewer entrance to the factory on 24 Carrot Island (climb up into the bypass pipe to elude him).
You have to get the flies away from Ratman to defeat him. Climb up past the three rats on the right side to reach the final red wheel. Click it to dump sludge on Ratman. Now the flies attack you, but you can dodge them long enough to jump to the large center pipe, and over to where Ratman is.
At the top right, where the rats are moving back and forth. In the sewer, you turn two of the same control wheels ; the one at left to lower the level and the one at right to raise it. This final one dumps sludge on Ratman and gets the flies away from him. (Unfortunately, they attack you.) (see the related question)