Abstract: Process for cleaning hard surfaces, characterized in that said process is carried out using a foam based on a formulation comprising: (A) at least one complexing agent selected from the alkali metal salts of aminocarboxylic acids and from alkali metal salts of citric acid, gluconic acid, tartaric acid and lactic acid, (B) at least one non-ionic surfactant of general formula (I): (G)x-OR1, (C) at least one anionic surfactant, (D) at least one zwitterionic surfactant, wherein: R1 is selected from C8-C18-alkyl, straight chain or branched, x is in the range of from 1.1 to 4, G selected from monosaccharides with 4 to 6 carbon atoms.

Abstract: Methods for fast fresh surface formation between two fluids as well as a device employing this method to measure dynamic or equilibrium interfacial tension between the fluids.

Abstract: The invention proposes new methods for fast fresh surface formation of a drop or bubble of a test fluid and a device to realize the new methods to determine the dynamic or equilibrium surface/interfacial tension (ST/IFT) of this liquid. The methods are implemented by means of a single device which is used both for dynamic and equilibrium measurements of the ST/IFT. Depending on the method, the determination of the ST/IFT can be performed either by Axisymmetric Drop Shape Analysis (ADSA) or Capillary Pressure Method (CPM) or both. In addition, with this device the Drop Volume Method and Stopped Jet Method can be realized, which has been modified and improved with the proposed invention in comparison with the known methods. The combination of several methods for creating a fresh surface and of two techniques for determining ST/IFT in a single device allows choosing the most suitable method for a given fluid system considering the system properties and desired time range.