Hello everyone... first post, but active reader of this site! I've built my first (ever) chicken coop and run and as I'm pretty proud of that, I'll be sure to post pics and a video of it in a different post...what I am hoping to find out today is something that I've tried to find via google searching and through this site, but have been unable to do so... How do you clean the inside of your PVC watering system pipes? I already know of one problem (learn as you go...) is that I have a 3" PVC downward pipe connected to a 45 degree angle connected to a reduced 1.5" pvc pipe with nipples on it... As I've glued everything together, I have no way (at this time) to open the bottom end of the pvc (1.5") to clean the whole system out. What would you suggest to clean out the whole system? I am nervous to use bleach because I'm not sure I'll be able to make sure that there is no residue of that which could potentially harm the chickens... Ideas welcome!