If your floors are especially dirty you may have to change your water more than once.
Cleaning indoor flagstone floors.
Clean your flagstone mix together equal parts white vinegar and warm water.
Always make sure that the floor is well rinsed and then dry with a clean cloth.
Make sure you do not use apple cider vinegar balsamic vinegar or any other variety that is not clear as they can stain your flagstones.
Mop your flagstone floors using an up and down motion.
Spray your flagstones with the vinegar and water solution being careful not to soak any nearby vegetation.
I did this using a weak solution of tile doctor pro clean and clean water the concentration is adjusted according to the level of soil build up.
Sweep your flagstone regularly with a dry broom or dust mop to remove dust dirt and debris.
When you have to clean with soap make sure it is a neutral cleaner with a ph of about 7.
A sponge can help to remove dirt and stains.
Later one must clean very well and dry the surface soon with a soft towel.
Make sure to rinse your mop often.
Sweep during your regular cleaning routine after a gathering or after a wind has come through.
Natural stone soap and water are an effective way to clean your flagstone floor.
Cleaning should be done using a sponge a soft cloth or a very soft brush to avoid that the surface is scratched and is done making circles.