Originally Posted by DaBills
I clean with oxy clean and then I rinse everything that touches the wort with star san at the recommended dosage. I was sooooo friggin careful my family thought I was psychotic. That's why it sucks so much.
Those are the correct products to use. You are not rinsing off the star San are you? Don't fear the foam.
Somewhere you are missing something. I highly doubt it came from the starter just siting in the fridge in a sealed vessel.