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Conventional cleaning products, the ones we normally buy to wash the floor , are certainly not suitable for lightening the joints.
Below we suggest the most effective trick to lighten black grout and clean the floor.
All you need is baking soda, a sponge and a little water.
Pour baking soda into a bowl, add water and pour onto the floor. Scrub with the sponge, applying a little force between the joints, then mop as you normally would.
There is no need to use a cleaning product. On the other hand, using a little vinegar as an alternative to floor detergent will disinfect surfaces and perfume the house.
You will see that with this simple trick, the floor joints will be like new.