A method for online cleaning of fouled PVC fills of cooling towers exposed to air /water borne dust/ bio-fouling using a combination of an oxidizer like hydrogen peroxide at a concentration range of 0. 1 to 0.2% by weight; surfactant like Linear alkyl benzene sulphonate 5-20ppm and dispersant like Polyacrylate, 2-15ppm wherein fouling material is bacteria and silt/ clay /suspended dust and using Ethylenediamine tetra acetic acid in the range of 0.05% to 0.2% weight by volume at a pH range of 9.5 to 11 in the presence corrosion inhibitor Rodine 2000 (Henkel Chemicals) or equivalent inhibitor having similar compositions as Rodine 2000 for dissolution of calcium carbonate based scale deposit from PVC fills.
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