Pick a sunny day with no rain the forecast. Use Weed-B-Gone or
Spectricide per directions on the bottle. Dandelions that are
well-established may require a second spraying 2-3 weeks later. Make
sure you wet all the leaves with the product. A garden sprayer is
easier on the back than a hand-held sprayer bottle, especially if you
have a lot of dandelions to treat. Do not mow 2 days prior or
following the treatment.