My tiler had finished tiling the wall tiles in my place and I noticed a number of joints between the wall tiles were dirty and yellowish.

The tiler blamed the problem on the quality of the wall tiles (which were from Hafary) but I suspect it is the tiler's fault.

Have anyone experienced this before?

My tiler had finished tiling the wall tiles in my place and I noticed a number of joints between the wall tiles were dirty and yellowish.

The tiler blamed the problem on the quality of the wall tiles (which were from Hafary) but I suspect it is the tiler's fault.

Have anyone experienced this before?

The dirt cannot be cleaned???

My contractor would do a clean up for me before hand over the house to me.

My contractor would do a clean up for me before hand over the house to me.

Should be white joint lines. Get your contractor to do touch up.