This is a very popular questions
The industry standard is to use a Neutral PH Cleaner (7)
The lower the Ph number the more Acidic
The higher the Ph number the more Alkaline
If you use an Acidic Cleaner and do not neutralize the acid with an Alkaline product it may burn when contacting with the skin of pets and children. This can be a real problem in a residential setting.
Acid will deteriorate your grout and sealer
If your cleaner has an acid Ph of 3 you must neutralize with a alkaline cleaner of a Ph of 10 to bring it back to a neutral Ph of 7.
You can find a neutral floor cleaner at Home Depot (Zep has one)
Or ask your Janitorial supplier