Wet processing of textiles has recently focused attention on sustainable dyeing. Reactive dyeing is one of the eco-friendly dyeing processes, aside from nano dyeing, which is yet to commercialize. The hydrolyzed unfixed dye and loosely fixed dye molecules, however, tend to yield erroneous color strength readings following dyeing. The goal of this research is to improve the frequently applied soaping after-treatment procedures employed after reactive dyeing. With infrared exhaust dyeing equipment, a single jersey cotton knitted cloth weighing 160 grams per square meter was colored with VIVIZOL blue in 4 hues (1%, 3%, 5%, and 7%). For the post-treatment of colored materials, the soaping chemicals Exoline Magic M (EXO-M) and RG-Hxc were employed. The color strength ratings were used to determine the samples’ effectiveness at removing dye. To develop samples, Taguchi L9 orthogonal array experimental planning was employed. The elements that affect soaping efficiency were determined to be liquor ratio, concentration of soap used, temperature, and time. The responses were evaluated using the signal-to-noise ratio (S/N). MINITAB software was used for taguchi design of experiments. According to the study’s findings and observations, the RG-Hxc soaping agent removed hydrolyzed dye with a removal efficiency of 24.8%, while the EXO-M washing agent had a removal efficiency of 20.6%. Using 2 g/L RG-Hxc, the soaping operation was performed at a temperature of 90 °C with a bath liquor ratio of 1:10. Compared to EXO-M soaping agent, RG-Hxc soaping agent for 15 min showed greater hydrolyzed dye removal efficiency.

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