Our clothes will periodically come out of our washing machine with brown splotchy stains. I suspect it's either rust or oil/grease getting into the drum. How can I diagnose what it is exactly, and prevent it from happening?
Edit: I have wiped down the top of the drum, both on the inside and above the drum where it meets the metal chassis of the washer.
I also removed and cleaned the fabric softner container, and removed the agitator and cleaned the inside and below the agitator (there was a ton of built up dirt). After removing the agitator, I cleaned that in the sink with soap, water, and baking soda. I cleaned by filling the drum with hot water (as if about to start a cycle), and then adding a cup of bleach and cup of baking soda, while leaving the door open. After letting soak for an hour, I scrubbed the place where the agitator attaches to the bottom of the drum and wiped down all the loose dirt.
I also stumbled upon an errant bobby pin, which I suspect has been the real culprit here. Will answer this question if the splotches disappear. Thanks to @ noybman for all the help.