How do you clean a clogged skimmer line?

You could try using a plummers snake, or an electrial snake, put it down the pipe and go until you find the clog then twist and try forcing the snake forward, this may take many trys before you are sucessful, if you feel you have mouved the clog try running the pump to pull the clog free from the pipe and send it to the pumps skimmer collector.