Based on your specific needs, acoustical ceiling tiles can be either porous or non-porous to either dampen sound in order to create a quieter work environment or to help sound project and carry throughout your space. Whichever type of tile you are using, it can get dirty and stained like any other surface. Many people consider replacing or painting these tiles when the ceiling gets dirty, however cleaning them is a great alternative to consider.
Replacing the tiles can be expensive and time consuming.
Re-painting only covers up the problem. Also, painting over the tiles will reduce or even eliminate the desired function of the tiles.
Cleaning them will not only be a cheaper and cost-effective alternative, but it will help to preserve your ceiling's condition while making it look like new again!