A compacted clay liner is constructed at the bottom of landfill sites, which serves as a hydraulic barrier to flow of leachate from wastes. The performance of clay liners could be degraded when they are exposed to the leachate from bottom and fly ash with various contaminants. In the present study we conducted serial batch tests with 110 repeated washings for different pH solvents to predict long-term leaching patterns for heavy metals and other soluble ions in the bottom and fly ash. The equilibrium pH of leachate for pH 3 solvent began to decrease dramatically immediately after starting of washing. For the solvents of pH 3 and above, a few mg/L, Pb was leached while Zn and Cu were scarcely dissolved. The heavy metals were all dissolved in a geater amount by pH 2 solvent compared to other pH solvents. For the soluble ions other than heavy metals, irrespective of solvent pH, Na, K, Cl, and SO42-were all leached in a great amount in an early washing stage and Ca was leached throughout washings, while Mg was scarcely dissolved for the pH solvents other than pH 2.