Red Stain on gpu waterblock

[Grosjambon]

Hi everyone, I bought an used ek waterblock for my vega 64 and it has red stain on it (on metal and acrylic part)
I did a closed loop run (pump res gpublock) with white vinegar and tap water (10% white vinegar). 8-10hours

It did a really good jobs removing the clog in the gpu waterblock but I still have red stain and I would like to know if its possible to remove them at all or not.

https://imgur.com/a/0baRdk4

Anybody has some other trick to help me?

 

[Blaylock]

It looks like it's just a stain from colored dye. I don't know of anyway to get rid of it, but if I'm correct than it will not effect the performance of the block.

 

[Silver Surfer]

^I agree!

 

[maxfly]

mr clean magic eraser should take it right off. i promise they really do work.