bleach, wash, clean
澼 centers on using water to make something clean or pure: bleaching, washing, or cleansing. The idea is removing impurities through liquid action.
澼 combines 氵 (water) with 辟, which likely contributes the sound. The character expresses washing or bleaching with water.
Water 氵 pours over the right side 辟, like a powerful cleaning agent bleaching fabric or washing away dirt.
For ヘキ, imagine a heki (a made-up cleaning brand) bleach bottle pouring water onto the 辟 component: heki -> ヘキ, and the water cleans everything.