What I use is one of the reusable types like this.Originally Posted by MightyMitre
You can use the disposables, but as often as I get issues with yeast, etc, it just isn't economical.
But, I essentially put 50ml of white distilled vinegar and then fill it up with warm water. Then you screw in the top, and place it up inside there and then squeeze the bulb. The reason for vinegar is it creates a slightly acidic environment which yeast doesn't like.
Afterwards, I rinse out the bulb portion and hang it upside down to dry. I use an antibacterial soap on the portion that goes inside and clean it. It also hangs with the opening down so it dries completely.
Mel