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Any idea's...? 
Quoted from "NikoMo"
WARNING
don't use alcohol for cleaning the plexiglass part of the cuplex. it might damage or maybe destroy it.
for this you should use normal glass-cleaner (or simply water)
"WARNING 
Quoted from "aviddigi"
ketchup and a rag, someone had brought me a danger den cooled 6800 block. NO copper color just green monsters all around, Ketchup on to the rag or tooth brush then i used a metal polish called FLITZ to get the shine back.
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