I got a grass fertilizer a few years ago that had a weed growth inhibitor in it. I put it on in the spring. I ran out before I finished EVERY part of the yard and I didn't have enough yard left to want to run out and get another big bag of it. So I left it. It was kindof cool to see the effect that it had on the grass. I found that where it didn't get enough water the grass burned so obviously you'd have to water it at least at the beginning. Later in the summer the grass where I'd used the fertilizer had absolutely NO weeds growing in it and it was darker and thicker and greener and grew longer, faster than the area that had not received any of it. I think the brand was Scotts but I can't be sure. I do know that it was a large - knee high - bad with a green label. I think it was called Lawn Fertilizer and Weed Preventer. I was very impressed by the success. If I had used it on my entire lawn I would have been weed and dandelion free completely and for the whole summer, with only one application. It seems to me that prevention is better than fighting the weeds all summer long.
As for the chemicals you mentiond, I would hesitate to use the vinigar but I'm not sure about that one. The alcohol would probably evaporate and dissipate quickly enough to not damage the soil for future growth but because of that evaporation may not do enough damage to the weeds. The salt would be a definate no-no. That's a pretty obvious one, because of the lack of grass on the sides of roads after winter. The salt is so damaging to the soil that just the run off from the melting snow on the roads pushes back the growth of grass and plant life on the edges of the roads. As for the bleach, I would DEFINATELY not use that. It seems to me that would be too damaging to the soil and probably other plants. I would recommend Scotts or Miracle Grow spot treatment if you don't want to go the weed preventor route. I have had reasonable success with those. Otherwise, I do go and pull Thistles and dandelions myself occasionally.
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"Always learn the rules so that you can break them properly." Dalai Lama
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