RE: WD-40
Why did they leave the main purpose of WD-40 to the last in the list?

43. If you sprayed WD-40 on the distributor cap, it would displace the
moisture and allow the car to start.

And although WD-40 may do some or all of the things mentioned there are
products specific to most of those uses that do it better.  And keep in mind
that WD stands for "Water Displacement", the function it was originally
marketed for.  The carrier acts as a mediocre lubricant but it is not a
lubricant especially for applications that really need that function.  And
it will tend to grab and hold dirt worse than many other products.  And for
our Vanagons and the sliding door (where we ar tempted to use WD-40) there
are many better products on the market especially those intended for just
that kind of application.  Just like the multi tools that kind of sort of do
everything but do none well one can of WD-40 is not the cure all for all
ills.