This is an alternative to your store brought weed sprays that contain harmful chemicals, such as glysophate.
Salt and Vinegar Weed Killer
7.5 Litres of Vinegar
1 Cup of Salt (240g)
2 Tablespoons of Detergent
This works especially well on a hot day. Be careful not to get any on your desirable plants.
Mulch and news paper are still better for your soil than salt and vinegar, but this offers a solution where paper and chip is not an option. Spraying this on a path or driveway on a hot day, will clean up the weeds pretty quickly.