Apply the isopropyl alcohol to the latex paint. If removing paint from a large area only apply the alcohol to a 3 inch square area at one time.
Cover the area with plastic cling wrap. Alcohol evaporates very quickly so you must cover it to keep it moist so it can do its work loosening the latex paint. Allow the alcohol to sit on the paint for 30 minutes.
Lift the plastic wrap off the area and set aside. Rub the latex paint with the towel to remove it. If the towel does not remove the paint, gently use the scraper to peel it from the wood surface.
Wash the area with water to remove the last of the alcohol and paint. Dry completely to keep the varnish from warping.