Our table has a factory-applied lacquer finish over a dark, walnut
stain. Over many years, the table has been polished many times with a
liquid furniture polish,

Yesterday, I brushed MinWax Fast-Drying polyurethane on the table.
After the polyurethane dried, a very white "haze" and a lot of small
bubbles developed under the polyurethane (most likely a reaction
between the polyurethane and the underlying furniture polish).

Now, how can I remove the polyurethane and the polish so I can re-apply
the polyurethane?