Unfortunately, I still haven't found a way to get rid of BM poop stains. If the stain is in the plastic pad cover then I would just make sure to clean it with some sort of disinfectant and then try not to look directly at it. Or just cover it up with a receiving blanket or changing pad cover.
Yes, EBF babies have "watery" poop. Try Dr. Bronner's Peppermint Castille Soap. You can use it for a ton of different things, and it's great for getting baby stains out. Most health food stores sell it and now Whole Foods and Target are too.
Re: how to get BF baby's poop out of changing table pad.