Yeah. I get the cleaning part but what about the rocks and why do i need 2 junctions?get two 6" diameter PVC pipe T-junctions from Home Depot or Lowe's or whatever and go find yourself a nice long, wide flat rock from your local stream/river/lake bed or quarry or wherever near you has rocks , a clean source, no chemicals of course.....then you take them and put them in a container they can be fully submerged and boil a big pot of water.
Then you take the pot of water and pour it into the container w/ the rocks and pipes to sterilize it, let the water cool, and remove, rinse and build your cave. You can pre-set them before putting them in the tank w/ aquarium silicone if you want.....simply use the 2 pipes as a base - cover the tops with silicone, place the big rock on top and 48 hours later as long as it is cured and smell is gone, give a quick rinse and put it in the tank.
Alernate method for sterilizing - a bucket w/ 3% bleach, 97% water solution can be used to scrub everything down, afterwards, rinse for several minutes until ALL SMELL of bleach is gone, then set them in a bucket of water with dechlorinator for a few hours, rinse again and place in tank or pre-set. Allow to AIR DRY before using.
Alternate method #2 - (not the most direct or effective) scrub or soak everything down with WHITE VINEGAR , allow time to sit, then rinse for a few minutes and proceed as above
Questions?
Pics if possible