Purchase the correct cleaning solution. Look for a detergent cleaner that is made specifically for limestone-type stones, like lannon or marble. You can find these cleaners at your local home improvement or hardware store. Professional floor installers can also recommend cleaning solutions.
Dilute detergent in water. Get a bucket and fill it up with water. Add the cleaning solution until you reach a ratio of one part solution to five parts water. Watering down the solution helps to prevent it from eating through the surface of the stone and causing pockets of damage.
Apply the mixture with a sponge. Grab a clean sponge, dip it into the bucket, and apply it generously over the surface of the stone. The stone should be visibly saturated, almost to the point of dripping. When the water in the bucket gets murky, empty it out and replace it with clean solution.
If there are areas that you can’t reach, try pouring the solution into a bottle. Then, you can spray it onto the higher up spots on the stone. Let the cleaner sit for 10-15 minutes. Once all of your lannon stone is saturated with cleaning solution, leave it alone.
This lets the solution fully absorb into the stone, so that it can loosen any deep dirt or grime. If the solution seems to dry well before the 15 minutes are up, it’s okay to add a bit more.This is a general suggestion regarding how long you should leave generic stone cleaners on lannon.