What is the reason why the tiles of the bathroom are washed away by water and turn yellow

There are 3 main reasons for this:

1. The towel is not dehydrated and clean, and the towel will be yellow, and the problem of dehydration is not clean: if the towel is dehydrated and not clean in the washing, the residue of alkaline chemicals will be formed, which will remain in the towel fiber, causing the towel to become hard and the fastness of the towel will decrease, which is the main reason for the towel to turn yellow. >>>More

It means that the quality of the tiles is not very good, or the gaps in the tiles are not filled well, which causes discoloration (darkening of the tiles) when exposed to water. When the wall dries, the color of the tiles will return to the same state, right?

1.The towel is not dehydrated, and it will also make the towel yellow, and the problem of dehydration is not clean. If the towel is dehydrated and not clean during washing, the residue of alkaline chemicals will be formed, which will remain in the towel fiber, causing the towel to become hard and reducing the fastness of the towel, which is the main reason for the yellowing of the towel. >>>More

Personally, I think there are several possibilities:

1.The porcelain tiles should be soaked with water when they are attached to the wall, and your workers may have omitted this different process, resulting in poor adhesion. >>>More

Clean the wall joints in the bathroom, and then restore them to the original state.