hello janice478 and Old House, welcome.
Don't use straight bleach or other harsh chemicals to clean ceramic tile floors. Using straight bleach could strip the protective finish off the floor. If this happens, your tiles will be dull looking and become susceptible to staining and water damage.
Prior to cleaning the floors, vacuum up dust and dirt using the appropriate attachments.Regular Cleaning.
For the most part, ceramic tile floors only need plain water for cleaning. Washing Dirty Floors.
If your ceramic tile floors are particularly dirty, add 2 to 3 drops of liquid dish soap or vinegar to the water and mix well. Rinse the mop frequently. Refill the bucket as necessary. NOTE:
Make sure you don’t add too much dish soap or you could end up with too much suds. This will only make the job longer as it will require more rinsing for the residue to rinse off. If you don’t get all the residue up your floors could become dull.
Have a second bucket of warm water ready for rinsing the ceramic floor after you’ve washed them. Rinse the mop frequently to remove the dirt. Refill the bucket with clean water as needed.
When you have finished cleaning the floor, use a soft cloth, chamois, or sh-mop to dry.Severely Dirty Tiles and Grout.
If the floors are severely dirty you can use a solution of 25% bleach and 75% water to remove dirt. Rinse thoroughly.Dirty Grout.
If you have dirty grout, the best way to clean is to use a steam extraction method. This is steam cleaning with hot steam, detergents, water pressure and vacuum extraction. Steam extraction machines dislodge the dirt that is packed in the tiny grout holes and lifts them out once and for all.Keep your Floors Looking Great.
Use floor mats and always wipe your shoes off, or take your shoes off and put your slippers on.
Always vacuum or sweep before washing floors.
Do not use abrasive cleaners to prevent scratching and dulling.
Do not use straight bleach.
Don’t use ammonia based products as these can discolor some grout.