Hello and welcome to the forum!
I personally wouldn't use Zymol on your two cars. Its a high quality wax but it isn't for you or really most other Autopians. Why? First, their $50 wax is no better than a $15 can of
Blitz. It's just the packaging. Second, its mediocre durability and limited protection makes its not-so-good for daily drivers.
If I owned a classic that never faces the real world (except for the judges at shows) I would use it. But for my cars, something more durable and practical is necessary.
Instead of using a traditional wax like Zymol, I would suggest a polymer sealant such as
Klasse or Zaino. These sealants are much more durable... try doing a search on it.
Your two cars seem reasonably new, so there is no need to use an abrasive polish. Just try a clay bar, ABC system, or a gentle paint cleanser.
Good luck...
~bw