Hello,

Not sure what "extra strength" vinegar is, but horticulture vinegar, which is usually 15-20% acetic acid can be an effective weed control product. If the weeds are small, it may kill them with one application; if they are larger or more mature, it will take repeated applications. Hort vinegar is non-selective, so apply it to only weeds/undesirable plants.

If you do use this product, be very VERY careful. Wear long pants, long sleeves, gloves, and eye protection. Wearing a respirator would also be recommended. This product is very dangerous, as it contains a danger label. 

I can't advise you on any of the homemade products. But they too would be non-selective and mostly effective on small weeds. Exercise extreme caution by mixing your own pesticides.