I took my loop out few months back and I forgot to flush it out, I want to put it back in now but I've noticed limestone like build up on the tubing and waterblock, I've replaced the tubes but there is still this build up inside the waterblock and possibly the radiator too, I was wondering if it's still suitable to use and wouldn't cause an issue further down the line? I've tried running the loop with vinegar in for few hours it sort of worked, but didn't clear out most of the build up, is there anything that's better than vinegar that will clean the loop? If it's any help, I've only used Mayhems Pastel in the loop. Thanks