New tiles.... Wax coating???

[ColinMJ]

I used a school plastic ruler to flick off the wax after discovering it would flake off with my thumb nail. Water and scrubbing brush doesn't work. Wouldn't want to use a metal blade in case scratched the tiles

 

[Slippery]

I would avoid trying to pick them off with your finger and getting them under your fingernail, that way there is less blood and swearing and you will be of a better humor for the rest of the day

 

[PaulSmith]

Good scrub with a wet wipe sometimes gets rid.

 

[Andy Allen]

Ruined many a manicured nail getting that crap off tiles..

 

[Julian 'Farmer' Bonsall]

I use a plastic narrow scraper - similar to what one may use to apply wood / wall fillers. I've also used the plastic ruler method.