How to get a good grout line finish on slightly rounded edges

[Deleted member 57709]

Hi everyone,
The floor tiles I have are 600x600 white gloss which have a slight rounded edge to them so how do I get a purfect grout lines? will the normal wash with sponge achieve this just like the flat edge tiles or do I need a tool to do this?
Thanks in advance,
Gary.

 

[Dave]

Just a sponge will suffice

 

[Deleted member 57709]

Cheers David and thanks for the fast response.