Ash and grit are also supposed to be effective. Sprinkle slugs with salt to kill them. It is also possible to trap slugs using containers in the ground that have some beer in the bottom. Empty grapefruit halves work as well. If you have an older house you can save money on your heating bills by blocking up unused chimneys.
Mice seem to prefer peanut butter, bacon, and nuts, and chocolate to cheese in mouse traps.
A contributor suggested sprinkling Epsom salts at the back of cupboards as a way of eliminating silverfish.