Yes, coffee. Just regular, ground coffee beans (not instant coffee as you want something that doesn't dissolve).
My plastic overflow tank was starting to look a little grotty on the inside and I stumbled across this post with some cleaning advice: http://rennlist.com/forums/944-turbo-and-turbo-s-forum/515256-how-to-clean-dirty-coolant-tank.html
Gave it a try myself - it works really well!
Cleaning a coolant overflow tank with coffee
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Cleaning a coolant overflow tank with coffee
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Re: Cleaning a coolant overflow tank with coffee
Well waddaya know...coffee enema does work!
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