How do you white wash a finished piece of wood?

Hi Kim, here is some information on white wash. Hope this is helpful. Technique #1 Paint and Water: Steps

1. Mix paint and water to desired consistency (for this example, I used equal parts).
2. Dip rag in mixture and apply it liberally to the wood as you would a stain, wiping over it with a rag to evenly distribute it.
3. Dry and repeat coats until desired opacity.

How to Whitewash Wood: 3 Simple Techniques — The Family ...

https://www.familyhandyman.com/woodworking/...wood/how-to-whitewash-wood-3-si...

Lightly sand the wood then stain it just take some white paint with a little water paint the wood let dry or put on with a wrap let dry between coats

I like the minwax brand white wash stain

You can use stain for a white wash look. You can also take a candle, rub it on random parts of the wood, paint over it and then sand where you rubbed the candle. This will also give it a more weathered look.

create mixture of water and white paint and then brush a light coat on the wood