I have no experience of the provent so can't comment, but there is an intercooler cleaning how to here www.discovery2.co.uk / Workshop / Intercooler Cleaninr
I used an engine degreaser when I've cleaned my 200TDi intercooler. Probably 1/4 filled the intercooler, blocked both ends and gave it a really good shake about, drained it and depending on how dirty the cleaner came out repeated. The washed rest of the cleaner (It was a water soluble degreaser) out with water and let it dry before refitting.


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