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Compounds like caffeine and diterpenes can be toxic to insects, making coffee grounds an effective deterrent against mosquitoes, fruit flies and beetles. You can keep bowls of grounds or sprinkle them around.
Since coffee ground is abrasive, it can help remove build-up from surfaces that are hard to clean, and even help sanitise them due to their antibacterial and antiviral properties.
You can compost your coffee grounds for later use. Adding coffee grounds to your compost can also make it richer in nutrients and help reduce greenhouse gas emissions.
Coffee grounds contain several minerals which promote plant growth. It can also help absorb heavy metals that can contaminate soil. It can also help attract worms and keep slugs and snails away from your plants.
Coffee grounds contain nitrogen and can absorb and eliminate odours. You can place a bowl of coffee grounds in your fridge to get rid of the odour of spoiled or fragrant foods, or in socks, gym bags, smelly shoes, and wardrobes.
Fleas are a common problem in household pets, but since the little pests do not like coffee, you can use it as a natural alternative to get rid of them. Simply rub the coffee grounds on your pet’s fur after shampooing, rinse it off and allow your pet to dry as usual.
The coarse particles in coffee grounds can also be used for exfoliating your skin and help remove dirt and dead cells. You can do so by mixing coffee grounds with a little water or coconut oil and applying it directly onto your face and body.
Coffee grounds can also be used as a natural dye. It can be used to colour cotton, rayon, linen, paper, and more. The grounds can also be used to darken brunette hair.