The one thing that we all hate, but rarely attack are weeds in our grass. I for one have a motto "see a weed, pull a weed" however in some lawns, including my own, you could be out there for hours. Thats when we resort to chemical warfare.
Keep in mind its not that hard to get on top of. Just make sure to find a good selective herbicide that takes care of your particular problem. Word of caution, if you have a buffalo variety please take that into account.
Alot of lawn weed issues are caused by broadleaf varieties which includes bindii and clover. Manufacturers are smart and realise this, thats why the choice of product can sometimes be overwhelming. If you need a hand we are happy to help.
Little tip, I've heard good things about a product called "Bow and Arrow".