Adam Clarke on Ezekiel 36:25

Then - At the time of this great restoration - will I sprinkle clean water upon you - the truly cleansing water; the influences of the Holy Spirit typified by water, whose property it is to cleanse, whiten, purify, refresh, render healthy and fruitful.

From all your filthiness - From every sort of external and internal abomination and pollution.

And from all your idols - False gods, false worship, false opinions, and false hopes.

Will I cleanse you - Entirely separate you.