Here in the states, you can purchase inexpensive pumps for liter bottles at Wal-Mart. Or you can purchase a soda dispenser for liter bottles at www.kitchencollection.com . You also can purchase very inexpensive "soda savers" can lids for cans at www.kitchencollection.com.
I have used both the liter pumps and the can lids and think they work as well as can be expected considering that the pop will eventually go flat no matter what you do. However, they both extend the fizz and the expense for both is almost non-existent compared to what you can save on soda. ... View related article.
Use the Oxiclean (or a cheaper generic version from a dollar store like I do) again. A pair of my toddler's pants was wet and was accidentally left at the bottom of a hamper. When I found them, I thought they were ruined. But I soaked them in a strong solution of hot water and Oxiclean about three or four times over a period of two days. It worked and my toddler is now wearing those pants and you would never know they had had mildew like that. ... View related article.