One of the key tells of a woodie (i.e. incomplete mixing of the metals in the planchets) is whether the lines seem to match on the sides. The lines are caused by the compression of planchet rolling so if they are going in different direction then the discolouration was caused by cleaning.
Here's a 1859 Large Cent with a liquidation (woody) error.
For a while I went back and forth on whether this was cleaning damage (since the coin has been cleaned) or liquidation, but the pattern continues into the protected non-cleaned areas and is identical on both sides. At some point I want to get it under an XRF