Modified Sewer Route
The initial clip remains the same as the one describe by Nosferatu. After this clip, turn around and boost up using the corner. Jump onto the pipe and then the corner. Instead of boosting up, jump around and land on the slanted wall. Keep boosting up until you get to the top.
Update: If you can manage Nosfera_2's triple clip, then this strategy is not for you. I do find this to be a safer alternative though.
The initial clip remains the same as the one describe by Nosferatu. After this clip, turn around and boost up using the corner. Jump onto the pipe and then the corner. Instead of boosting up, jump around and land on the slanted wall. Keep boosting up until you get to the top.
Update: If you can manage Nosfera_2's triple clip, then this strategy is not for you. I do find this to be a safer alternative though.