but of course, that's not vinegar, just acid.

works best but it loses its effectiveness after a few days and should be replaced. A few drops of dish soap break the surface tension so they sink and drown, otherwise they can do the equivalent of "walk on water" and just fly away. There are also drain flies that might be mistaken for fruit flies but the cure is the same for the drain pests.

label puts an emphasis on WEED control and lists Bluegrass and other grasses under "Weeds Controlled". I don't consider bluegrass a weed and I don't think most others would either. Most people don't read the fine print on labels, policies and lots of other documents but for our protection, we should. The text does say it will kill various grasses for 6 months -- he's screwed. However, a greater and more obvious emphasis should be displayed on the label that it kills grasses for an extended period of time.