How to get rid of weeds on cement cracks

How do weeds grow on cement?  People constantly walk on cement side walks, creating small cracks and leaving dirt behind.  Wind eventually blows this dirt into the cracks.  After many days, weeds begin to grow withing these pockets of dirt.  As the weed grows, the cement cracks grows with it. Leaving this alone will not only be an eye sore, but it will cause the cement to eventually crack.  If your house is sitting on this cement, the foundation of the house is now compromised.  So how do you properly remove the weed off cement or concrete?

Step #1 Use a screw driver or weed tool.
Loosen up the gravel in the cracks and remove the weeds.

Step #2 - Use a pair of pliers to remove the weed roots. 
Make sure you are very thorough with this process as it's the roots that cause them to grow back.

Step #3 - Wind in the middle of the night can blow all the debris back into the cracks
Sweep up all the weeds and debris around the area. 

Step #4 - Loosen up the gravel inside the cracks. 
Use a hose to water out all the loose gravel within the cracks.



Step #5 - Pour boiling hot water onto the cracks. 

This will kill all the remaining roots or seeds that's hidden deep inside the cracks. 
Do not use chemicals or vinegar if the concrete is near a your garden. 
If these chemicals leak onto your garden, it will prevent the plants from growing.

Step #6 - Place a chalk mark at every location where you pulled out weed. 
Wait 24 hours so that the water inside the cracks can dry up.

Step #7 - Place the bottle in warm water for about 10 minutes to warm up the liquid.

Put on some plastic gloves and cut open the tip of the bottle.

Fill each crack up with cement. 
Since the weeds do not have sunlight, it will not grow again.

Wait about 24 hours for the cement sealer to dry.
For cracks larger than half an inch, use Dap 31084 Concrete Patch (Interior and Exterior)