Over the Years i have tried too many products to remove dried on wax, and all have failed. Until one day i went a car show here on the island, and someone showed me small sponge to soak in water and then rub it in the effected area, and walla it worked, but it also cost $10.00.
A month later, someone that has no idea about wax's or detailing vehicles, showed me something that costs $2.00 and you get a poop load of it in contained that does the same thing and safer, that person is my Wife, and the product is Mr. Clean Magic eraser, at your local supermarket, she uses it on almost anything, including the walls, when i touch them with my dirty hands.
So, take a walk to the supermarket and solve your dried on wax problems for pennies.
Claude:buffing: