On my 960 I only gently wedge fully open the butterfly and clean with a petrol soaked rag around a thin stick. Cleans it beautifully and dead easy. Make sure the 2 or 3 vacuum holes half way down are clear; make up a simple piece of bent wire for this. Job done!
IE, with the amount of crud around yours from the photo, I would have a look at the engine breather pipe and filter.
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