Final answer:
Ceramic tile grout can be cleaned with either acidic or alkaline cleaning agents.
Step-by-step explanation:
Ceramic tile grout responds to cleaning with either acidic or alkaline cleaning agents. Acidic cleaning agents, such as strong mineral acids, are mainly used for the removal of inorganic deposits like scaling. On the other hand, alkaline cleaning agents, like sodium hydroxide, can dissolve greases and other organic substances.