Section 13(ii) in The Merchant Shipping (Control of Pollution by Noxious Liquid Substances in Bulk) Rules, 2010
(ii)when small amounts of cleaning additives (detergent products) are added to, water in order to facilitate tank washing, no additives containing Pollution Category X components shall be used except those components that are readily biodegradable and present in a total concentration of less than ten per cent, of the cleaning additive:
