Hi lilletlet!
The only methods I have used to get wax off of anything are:
1) ice cubes which harden the wax, allowing you to chip it off (and since it's your sink I would use a plastic or rubber spatula); and
2) paper towels and an iron set on low heat, just enough to melt the wax, and paper towels to soak it up. I have found that this method gets the wax off without leaving a mark and works on most items, however, I have a porcelain sink so I can't attest to its use there.
Please let us know what works for you, and good luck!!
The only methods I have used to get wax off of anything are:
1) ice cubes which harden the wax, allowing you to chip it off (and since it's your sink I would use a plastic or rubber spatula); and
2) paper towels and an iron set on low heat, just enough to melt the wax, and paper towels to soak it up. I have found that this method gets the wax off without leaving a mark and works on most items, however, I have a porcelain sink so I can't attest to its use there.
Please let us know what works for you, and good luck!!