Wax grid removal from porcelain tile

[flanbo]

I'm looking to buy some porcelain tile which has the bottom grid imprinted on its face. Believe it's a wax. The tile was stored outside and some how it was imprinted. It's a great deal for expensive tile I need. Any ideas how to remove or seen the markings?

 

[Chris Francis]

if it is was try hot water low pressure other then that would not try any hard chemicales might take the finish off them.