This was seen on a local news channel's website. Have any of you ever tried this? If so please share your results. Lawn Tonic Recipe One can of soda must not be diet soda One can of beer not light beer 1/2 cup of liquid dishwashing soap 1/2 cup of mouthwash 1/2 cup of household ammonia All ingredients should be mixed into a 10-gallon hose-end sprayer. Youll want to apply it every three weeks. You should mow your lawn late in the evening and then apply the lawn tonic immediately after that.