Well you can buy tubs of alleged "organic pest repellent" here (at considerable expense) that clearly pong of stale garlic. I can attest to the fact that they don't work.

Garlic is a beautiful thing. Roast it whole or in cloves (in foil with olive oil), throw unpeeled cloves into your Mediterranean roast potatoes (don't forget the rosemary sprigs), or in your one-tray baked chicken pieces, bash the cloves with your fist to chuck into stews, slice thinly to sauté in olive oil for your pasta dishes, stuff garlic pieces into nooks and crannies in your roast lamb, but always fresh garlic. And only ever mush it up, in very small quantities, for pesto. We buy little jars of garlic cloves in oil and herbs, Marché style, that we eat avidly in quantity. Garlic abuse should be a criminal offence to be dealt with by the nearest constable. No tubes of "garlic paste," no crushing cloves in a press for ragù, no dried garlic. I'm thinking of starting a change.org campaign...