Cleaning water barrels

I found a place locally to get water barrels for storage.  They are priced right, $5.00 each.  The barrels are FDA food grade plastic.  They were originally used to hold vinegar.  They dont get reused.  I know the vinegar wont be a problem to store potable water.  My main concern is the vinegar residue in the plastic going to taint the taste of water if stored for any period of time?  What would be the best way to clean them to get rid of any taste issues??

Huck wrote: I found a place locally to get water barrels for storage.  They are priced right, $5.00 each.    Great price!!!   The barrels are FDA food grade plastic.  They were originally used to hold vinegar.  They dont get reused.  I know the vinegar wont be a problem to store potable water.  My main concern is the vinegar residue in the plastic going to taint the taste of water if stored for any period of time?  What would be the best way to clean them to get rid of any taste issues??   Some food grade barrel processors use bleach and water. You should be good to go.