I'm intrigued to know why this is deemed necessary? If the strainer is blocked, then there is something seriously wrong, and may need a total engine strip to resolve!
@bluezie is right, the oil pick up strainer is quite a coarse type of filter, if your van isn't showing serious problems you'll achieve nothing by dropping the sump to clean it.
Any problems with carbon deposits will be in and around your EGR valve and inlet manifold, but that's a whole different subject.
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