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Inner surfaces of the supply air delivery system are part of the indoor surfaces. This and technical performance make it important that cleaning of a HV AC system should be included in a proper maintenance program. Research work and cleaning actions have been done in many countries, however, the methods to verify the cleanliness varies and they seem to measure unequally the cleanliness. Filter sampling method is the most used method for determination of dust and debris amount on the surface. However, the dust loosening techniques differ in the methods and the results from different studies are not well comparable to each other. Dust tape and gel tape methods are applied more recently and they seems to be suitable quick tests for surfaces which are not heavily contaminated with dust layer like surfaces in recently built systems. Oil residues are ·also a group of contaminants that decreases indoor air quality of ventilated spaces and a method to verify this contamination is also discussed in this paper.