To Destroy Insects and Vermin

Dissolve two pounds of alum in three or four quarts of water. Let it remain over night till all the alum is dissolved. Then with a brush, apply boiling hot to every joint or crevice in the closet or shelves where croton bugs, ants, cockroaches, etc., intrude; also to the joints and crevices of bedsteads, as bed bugs dislike it as much as croton bugs, roaches, or ants. Brush all the cracks in the floor and mop-boards. Keep it boiling hot while using.

Source: The White House Cookbook, F.L. Gillette