Acid detergent, concentrated liquid for laboratory use (phosphate-based), surfactant and solvent-free, to be used as a prewash agent or as a rinse additive in automatic machines, with neutralising and descaling effect. Suitable for use in removing organic remains, proteins, organic bases and amines. Also suitable for the removal of calcareous remains and incrustations in thermostatic baths, auto-claves, evaporators, etc.