Enterprises have to set up drying equipment to recycle a large amount of water used for manufacturing purposes. Several awkward postures occur when workers are engaged in cleaning operations. The current study used Rapid Entire Body Assessment (REBA), Ovako Working Posture Analysis System (OWAS), and Ergonomic Assessment Worksheet (EAWS) to evaluate the risk level of musculoskeletal injury before and after the improvement. The outcomes indicated that the necessity of utilizing three evaluation assessments and provide a case study for the evaluation and improvement of similar working postures.