Applying anything to the dash could lead to adhesive problems under the leather and then it can separate and have a wavy appearance. If you apply any sort of cleaner or leather conditioner I would only apply the smallest amount possible and wipe off any extra almost immediately.
Also, anything you apply to any dash, leather or not, can evaporate in the hot sun and cause haziness on the inside of the windshield so be cautious of that too because that's not fun to clean.
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