Best thing to use to clean out watercooling system?

[schumi84]

Hi there, i have a Socket A watercooling kit that i dont use any more and was looking to give it a good clean out before i sell it on.

Was just wondering what would be best to clean it out with, anything specific.

Cheers very much

 

[schumi84]

Ah right, lovely, thanks very much.

Will give it ago in a bit.