So I just changed the fluid in my pc. I noticed had had quite a bit of corrosion (?) on my fittings. IÂ’m a bit confused about what has caused this. IÂ’ve only used Mayhems X1 coolant. I thought it had corrosion inhibitors in it. I have used one of their blue dyes in my coolant for about a year. I ended replacing all my fittings and cleaning my rad out with vinegar and water. IÂ’ve refilled the loop and all is running well but I would like to know how to prevent this in the future. IÂ’ll attach some pictures. This system is only about 2.5 years old and the fluid has been changed 2 times previously.