Rhianon - if you have a spotlight near you, they sell washers in packs of 10 for $5. A lot better to use then fleece (which won't absorb). Water's just fine, or you can make up a mixture of water, baby oil and baby bath to soak them in. If you have a tupperware container, just make up the mixture in that and either squeeze the washers in that, then store in a lunchbox, or a snap-lock bag.