CLEAN IT REAL GOOD
We have found that the BEST possible solution to clean the pipes is with salt, warm water, and isopropyl alcohol. Pour salt directly into the pipe, add some warm water (not hot water), add some isopropyl alcohol and shake vigorously. Rinse thoroughly and repeat as many times as necessary. Do not ever put it in the dishwasher, not even the top shelf! Avoid using super hot water as the super hot water may warp the pipe.
Little brown/black spots may appear on the inside of your pipe. This is NORMAL, this just means that it's time for a clean!
Always remember to dump out any water from the Bases or Lifters after use. This will help prolong the life of the pipe and keep it cleaner. Also, be sure to remove the threads from the rest of the pipe, as the threads do not react the same to cleaning products as the PLA does.