Request: add Scouring Agent option to "dye items" vendor UI

[5119]

It is currently possible to accidentally apply dye colors to items that "can not be dyed" by using the "apply color scheme to all items" option in a vendor's "dye items" UI.

Unfortunately, it seems to be impossible to remove dye colors from those items, though. If you attempt to use an item-based bottle of Scouring Agent from your inventory on a "can not be dyed" item that has been dyed in this way, you just get the same "this item can not be dyed" failure.

I would like to request that some kind of "Scouring Agent" functionality be added to the vendor-based "dye items" UI. Thank you.