Routine Cleaning Procedure
Option 1:
(Most Preferred) Attach blower nozzle to an air hose and apply evenly-dispersed compressed air over foam, focusing on affected areas. Depending on PSI, keep blower nozzle a minimum of 3-4 inches away from foam. Use best judgment so as not to penetrate the foam.
Option 2:
Vacuum the melamine foam treatment. Use a shop vac or vacuum with wand attachment. Little handheld vacuums are suitable too. Hover vacuum over the melamine foam close enough to suck up dust and debris off of the foam but not too close to suck portions of the foam into the vacuum.
Option 3:
Gently wipe the melamine foam acoustical treatment with a very damp, clean cloth but do not soak the treatment. Running a very damp, clean cloth over the melamine foam will help remove light dust and debris without oversaturating the foam.
Stain Removal Procedure
WARNING: Do not use Isopropyl Alcohol on printed Acoustic Panels. 
For light stains, first try using compressed air at the affected areas (see Option 1 above).
For heavier stains, use light application of isopropyl alcohol. Apply alcohol to dry cloth and gently rub acoustical treatment. Next, lightly dampen the same cloth with warm water and rub the same affected areas on acoustical treatment to help remove the smell of the alcohol. The foam is fine to air dry, or, use compressed air to quicken the drying process.
Contact Techlite for any additional questions.