1.The complaint lodged u/s498A of IPC is non compoundable i.e. can not be withdrawn by the complainant.
2. Ask your wife to execute an affidavit affirming that she had lodged the said 498A complaint under the influence of domestic rage and submit copy of the said affidavit to the police station.
3. Thereafter pursue with the police for filing charge sheet immediately.
4. After charge sheet is filed, you should file a petition before the high court u/s482 of Cr.P.C. praying for quashing the said FIR based on the affidavit executed by your wife.
5. High Courts do not entertain quash petition if charge sheet is not filed by the police against the FIR.