How do you kill grass'/weeds permanently and fast? ?

Question

How do you kill grass'/weeds permanently and fast? Salt, Bleach, Bug Spray need to do before this weekend. By the way can’t get down to the area in under deck/ramp.

Answer 1

Toss a pot of my wife's on them.

Answer 2

First choice would be Round-Up.  Spray it on and let it dry.  ANY plant it hits will die in a couple days, turn yellow and wither.

Next, pour on boiling hot water/strong bleach solution.  Takes longer to kill, isn't 100% effective, but cheaper than Roundup.