We strongly discourage using organic solvent to clean flux. The advised options are water with careful drying after cleaning, or no-clean flux. In general, we discourage long contact between Si-caps with agressive liquids in order to avoid any pollution and weakness on exposed sides. Please check the following link for details of agressive liquids.
Related terms : Silicon Capacitor(Si-Cap), Silicon IPD(Si-IPD, Integrated Passive Device), Assembly note