It looks to me as if there is thinset on all the edges of the tiles which will need to be cleaned off prior to grouting.
Remove thinset from tile joints.
The surface of the tiles is the easy part to clean off with water and scrubber the real problem is getting the grout lines cleaned out.
After setting tiles thinset mortar must quickly be removed or it dries into a hard stubborn substance.
It is very cheap and very fast way of removing mortar thinset and grout between tile.
While laying my ceramic tile 12 x 12 with 1 4 inch joints using versabond i used the spacers to clean out any excess thinset from between the joints.
Use a razor knife and or margin trowel in combination with a sponge to dig out the thinset and to wipe the edge.
Scrub the tile surface and the grout with a soapy sponge making sure to remove any of the thin set that is not entirely hardened.
Grout adheres to the unglazed sides of the tiles.
One of the ways to clean grout and remove the thinset is to start by adding some dish soap to the bucket of warm water.
Remove thinset that shows up during grouting before the grout dries.
How to remove tile mortar from grout lines.
How to remove tile mortar from grout lines remove the thinset from the work area to keep it from contaminating another grout joint.
Here is a easy tool to remove mortar and grout between tile.
Hydraulic lime mortar dry mixture of natural hydraulic lime and cork.
Wipe the tiles down with a dry rag.
Unsanded grout used with 1 8 tile spacing and less is not as strong as the more commonly used sanded grouts.
Given that fact and the fact that the joints are narrower making the grout more difficult to force into the joints it going to more important to have the joints as free of excess mortar as possible.
Dried thinset is tough to get off of the tops of tiles because it is so thin and the tile surface is often delicate.
Remove the thinset from the work area to keep it from contaminating another grout joint.
During the course of a tile installation you may need to beat a tile into the mortar to get it even in height with the surrounding tiles.
Most tilers attempt to remove the thinset as they work or the next day at the most.
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