And peace be upon you and the mercy of Allah and His blessings.
Grand Ayatollah Sayyid Khamenei (may Allah protect him):
The wash that suffices for ablution is only the wash of janabah (major ritual impurity). Of course, the precautionary wash of janabah does not suffice for ablution.
Grand Ayatollah Sayyid Sistani (may Allah protect him):
It suffices for ablution like the wash of janabah, although it is recommended and preferable to perform ablution before it.
May you be successful in all good.