I have just replaced a section of my copper water pipe due to a leak, when taking the section out I have noticed that there is alot of internal corrosion due to the amount of green copper oxide I can see inside the pipe. Is there any product or way of purging my complete line thought out my house to remove this build up and prevent further leaks.
That green oxidation is protecting the rest of the pipe. Unless you have chunks of corrosion causing you problems, leave it. If you clean it off, it will just reform on the newly exposed surface inside the pipe. Have the PH of your water tested if you think it's contributing to any pipe failures.