According to my observation, for whatever reasons, the mortar between tiles was not used the right mixture installed â¦. in between the tiles, there is some mortar and sand above the connection between the tiles.

It catches dirty easy. I consulted with some contractors. They suggested replacement of the floor which I am ready for this costly solution or knife off the dried mixture of mortar above the tiles... time consuming.

I used Oreck Orbiter Multi Purpose Floor Machine to scrub the floor a few times. The outcome was not so promising. .

There is big area to work on (12*13 sq fts). Some time it really bothers me. I am seeking better solution.

http://www.amazon.com/Oreck-Orbiter-Multi-Purpose-Machine/product-reviews/B004ZP4B60

Any suggestion ?

Thank you for your assistance.

Frances