Hi Bill...
IMO:
First:
-Unlike Meg's D156, FK#425, and DG#951;
-and, although some people will use OCW in
the same manner as the aforementioned three
products...(AFAIC: an unneeded expense);
-Optimum Car Wax belongs in the: Spray Waxes
(that actually contain Carnauba Wax) category.
Secondly:
•From my experiences with all of these products...
I see no reason that FK#425 can not be used for/in
every detailing scenario as are #D156 and #951:
-Their composition? Mostly water.
-They're all water soluble.
-They all leave "something" behind...
(except for Carnauba Wax).
Bob