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I wouldn't call KAIO a sealant. I simply don't trust the acrylic protection it offers. It is a good chemical prep rpduct though.
For wheel wells, paint them, or get a cheeper dressing. Dressings...

3M Adhesive Remover works, but don't "rub" with anything if you can help it.

Clay won't remove most wax. But the other options are all there.

Yeah!
In my own car I get to it, but hardly ever to customers pay me to do these things.
95% of the cars in this area have overdone undercoating and petroleum products sprayed int he wheel wells...