If you’d rather avoid the use of pre-emergents in your lawn, there are some things you can do to kill dandelions naturally. However, these methods aren’t as effective and will take longer to achieve the same results. It requires a lot of work and patience. You can get rid of dandelions by pouring vinegar or apple cider vinegar in a spray bottle and spraying your dandelions until they’re completely covered. It will only take a few hours for them to wither and turn brown.