Anything with a silicone base will crack any porous material, eg...dashs, tires, bumpers, ect.
It will do so because it doesnt allow the material to "breathe" so it gets dry & cracks as a result.
The best thing I have ever used is Lemon scented furniture polish. It smells good & works great. Lasts for a while. I like to get the cheap stuff at the dollar store. it's the same as stuff like Endust, ect.
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