Surly- Ya know, I use my APCs more around the house than I do on the vehicles.
On leather, I`d use something mildly acidic after anything ph-neutral (let alone alkaline), something like the Leather Doctor Rinse Agent that I like...forget the exact ph but it`s maybe 3.6-3.9 or so. Probably doesn`t matter much, if at all, on coated leather in great condition, but I`m pretty cautious about such stuff (maybe because most of my leather is far from like-new).
And I too really like OPC for nasty-greasy messes, hardly ever use it more than once (initial cleanup of a new-to-me vehicle) but I like having some around.
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