Mosquitos suck. Literally.

They can turn the most relaxed of backyard barbecues into a frenzy of swatting and knee-slapping. And then there are allergies and serious viruses like Zika that can be transmitted by the annoying little buggers.

But you know what sucks even more than mosquitos? Some of the commercial repellants that’ll suck your wallet empty over the summer season, especially if you’re the outdoorsy type.

Commercial repellants also tend to have more than a few harmful effects that arise from breathing them in.

The solution? Believe it or not, coffee grounds!

The Environmental Protection Agency says coffee grounds work as a very effective natural repellant that will keep many insects – including mosquitos, wasps and bees – away.

Many insects have a very strong sense of smell, and coffee grounds, which are incredibly strong-smelling when they burn, drive them crazy.

So how do you use them?