Silicone rubber is widely used in composite insulators and anti-pollution flashover coatings in the power industry. However,after long-term operation,it is prone to aging chalking and dirt deposition,which reduces the surface hydrophobicity. Hundreds of millions of silicone rubber insulators are in service for many years in the power grid,and it is urgent to study a new type of cleaning agent that can remove surface contamination and repair the aging layer of silicone rubber. The effects of different non-ionic surfactant content and repair agent content on cleaning efficiency and hydrophobicity were investigated. Experiments show that when the content of non-ionic surfactant is 3%,the cleaning efficiency is up to 95%. When the content of the repairing agent is 11%,the hydrophobicity is the best,and its hydrophobic migration can reach the HC1 level. Through scanning electron microscopy analysis,it is found that the micropores and cracks on the surface of the silicone rubber disappear after cleaning,and the surface is smooth,indicating that the cleaning agent has the ability of removing the aging layer and contamination,and repairing the aging insulators. This provides a theoretical and practical basis for continuing to develop silicone rubber clean-repairing agents and extending the service life of insulators.