Is there a natural weed killer that really works?

This is a good Hometalk article that goes over the pros/cons of various methods:

https://www.hometalk.com/diy/outdoor/pest-repeller/the-truth-about-natural-weed-killer-exposed-33053043?r=2

Try pouring boiling water on them. I haven't tried that method but have read several articles for weeds growing up in cracks of sidewalks and driveways and they say it works. Just be careful not to scald yourself.

An easy, inexpensive solution is to mix 1 gallon of white vinegar, 1 cup table salt and 1-3 Tablespoons of liquid dish soap (I use Dawn). Mix the ingredients well and pour into a spray bottle. Spray the solution onto the weeds and in 1-3 days the weeds will wither and die.

A no-cost solution is to pour boiling water directly onto the weeds. Need to repeat as they appear in various places on your patio.

Boiling water or vinegar work great! Easy, quick and almost free.

Maybe consider asking permission to fix them. I live in a rental also, my bathroom needed some work. I asked her and she said I could do whatever i wanted and to take it out of the rent. BLEW MY LITTLE MIND! so I pulled out the vanity and put in a pedestal sink (free Craigslist find) painted, replaced baseboards. She was thrilled it only cost $20. So the moral of the story is, the worst that could happen is a no for an answer. Landlords like it when we care about the appearance of the property as much as they do

There are several here on HM:

https://www.hometalk.com/search/posts?filter=weed%20killer

I just soak the area and pull the next day...I need the exercise! LOL

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1 gallon white vinegar and 1 cup Epsom salt and 1 tablespoon liquid dish soap Combine ingredients in

spray bottle and treat weeds at the hottest time of day for best results.