Optimum Products and new ways to clean the engine

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I have a 'new' old Jag. I got a 1994 Jag XJS with the 4.0L slant six in it. I would like to clean the engine bay but the consensus on the Jag forums is DON'T. Apparently the Brit electrics are allergic to water so the traditional cover certain bits, APC, and then spray it down. Some use brake cleaner etc but would rather not go that route. So I got to thinking, how would I use a combo of OPC, ONR, and/or Opti-clean?



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