Hello, I'm Danny.
I would just use a cooling system flush and cleaner like the Prestone brand. I've attached a picture below and it's available at Walmart for $4.00 Hope this helps and let me know if you have any further questions about this or tips on how to flush the system. Hope this helps and thanks for using 2CarPros.
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Friday, May 7th, 2021 AT 11:09 AM