It depends on the glue. If it is regular paste glue (school glue) or super glue.For super glue you need acetone which can be found in nail polish remover (not ace-tone free)cloth or cotton ball. Saturate the cotton ball with the acetone and wipe the area it is very wet. Wash the area to see if all traces of glue are gone, if not repeat until it is. Then launder as usual.