I like the vinegar idea, but will it harm my good grass in any way?
Killing Dandelions in Otherwise Great Grass
Certified GKH Gardening Expert
Here is an article that you may find helpful: https://www.gardeningknowhow.com/special/organic/homemade-pet-friendly-weed-killer.htm
Here's a recipe that may help using 1 gallon of white vinegar, 1 lb. table salt, and 8 drops of liquid dish soap. Mix the vinegar and salt in a pan on the stovetop. Bring to a boil so that the salt dissolves into the vinegar. Remove from stove and stir in the dish soap. Allow the mixture to cool. Pour into spray bottle and use a stream setting to aim directly into the middle of the dandelion rosette so that you do not kill the surrounding grass. Dandelions should die within a day.