Some councils will ask you to rinse your milk bottles before putting them in your recycle bin while others don't mind.If you are required to rinse by your council or you are one of those clean freak people who just can't help themselves, don't pour the rinse water down the sink when you give your milk bottle a cursory clean.Put it onto your herb garden instead and with the flick of your wrist, you add a little pest control and fertiliser.You most likely need to water your herbs every other day in any event, so when you rinse, simply fill your empty milk container with water and tip the contents onto your garden. This pic is of one of my pots of French Sorrel, Coriander and Parsley and I can honestly tell you that I absolutely never get any bugs and despite the world's worst soil quality, the garden always thrives.Don't worry if the milk mixture splashes on your lettuce leaves. When you water next, it will rinse off. See also: Grow a Herb Garden with Saved Kitchen Water
Milk is high in calcium, vitamin B and sugars and is also a fungus fighter. This little herb garden is fed milk bottle rinse around once a week along with sink water and never has any problems with fungus. As you can see from the pic, it is also lush and happy.
You can use diluted milk as a fungus (powdery mildew) spray or a mosaic leaf virus spray for your roses and tomatoes as well, but if you are bone lazy like me, just fill your empty bottle with water, give it a quick rinse shake and pour the water on your garden on your way to the recycle bin.