You simply need baking soda, a sponge and water.

Pour some baking soda into a container, add some water and pour on the floor. Scrub with the sponge, making a little force between the joints, then mop as you usually do.

It is not necessary to use a cleaning product. On the contrary, using a little vinegar as an alternative to floor cleaner will help disinfect surfaces and scent your home.

You will see that with this simple trick your floor joints will be as good as new.