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I've just been through this process and it is quite time consuming. The only way I could find to clean the inside was to fill it with solvant degreaser and let it soak for several hours, then rinse it out. Keep repeating this process until the stuff you flush out is clean. It took me a couple of days to do this. If anybody has another method or a particular brand of cleaner/degreaser they find effective, please let us all know. One note of caution (something which you may all be aware of) regarding water based degreasers. Most of these contain alkaline salts to varying concentrations. These solutions will attack aluminium alloys if they are too concentrated, too hot or left in contact for too long. They will leave the surface a dull grey colour. This probably doesn't matter inside an oil cooler, but be careful with any polished surfaces or items you want nice and shiny. Steven '71 Vert Fasty '73 FI Fasty Australia ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~ Shameless link for search engines: http://listarchive.type3.org ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~