Epic WTF

Not really epic, but whatever.

https://www.bosch-home.com/us/owner-support/get-support/support-selfhelp-washing-machine-citric-acid-to-clean-washing-machine

You might have heard that citric acid removes limescale and want to clean your washing machine with it. Unfortunately, this isn’t a good idea. Citric acid isn’t recommended for cleaning your washing machine because it degrades the rubber parts of the machine.
What to Use Instead of Citric Acid?
We recommend, using the Bosch Descaler to remove limescale and hard water deposits.

https://www.bosch-home.com/us/shop-productlist/cleaning-and-care/descalers/dishwasher-descaler/00311918#/Tabs=section-technicalspecs/

Ingredients: Citric Acid, Maleic Acid, PPG-4 Laureth-5