It seems like all the overflow bottle in the FC are all gunked up. Whats the best way to clean it real good? Mine is totally trashed. I want to erplace it, but OEM part is like 120 bucks. Damn this is the time when i awnt a VW, theirs is 12 bucks

 

try some prestone cooling system cleaner/flush.

Just dump a can in -fill it too the top with water, let it soak overnight. It will be perfect in the morning

 

hmm really?
let me try that
i didnt think those gunk in the overflow bottle can be cleaned out