Use steel wool to stop mice.
Seal cracks or holes in wall and baseboards with steel wool, which mice and other household pests can’t chew through.
Stop ants with a natural barrier.
Sprinkle a narrow, unbroken trail of cayenne pepper, black pepper, or salt across their path. Or draw a line with chalk.
Try ant-repellent herbs.
Ants dislike the strong odors of certain herbs, so try placing pots of mint, pennyroyal, rue, or tansy—or dried bunches of these herbs—near trouble spots. You can also frequently wipe down windowsills with oil of cloves or eucalyptus oil.
Keep cockroaches away naturally.
To discourage cockroaches, save the ends of cucumbers and place them in cupboards. Other repellents include vanilla beans and dried pyrethrum daisies.