Armour All is perhaps the worst product ever invented for cars. After is applied, it attracts dust like crazy and you end up cleaning the interior more thoroughly than if you just did it right in the first place. Also, if you use it on tires, they will turn brown from all the road dirt that sticks to them.
Don't get me wrong, I used to but the stuff in the half-gallon jugs. Then I realized a shiny dash isn't any better than a clean one. I never used it on leather, but it wouldn't surprise me if it harmed leather.
There is no pleasure in having nothing to do; the fun is having lots to do and not doing it.