I believe someone makes a long, flexible brush, kind of like a bottle brush with a long wire handle (6 ft), that is for cleaning out tubing. Kind of like a giant pipe cleaner. As around at the LHBS or contact George at finevinewines.com.
If you go to a grocery store, which has a bakery (like Wal-Mart), they will give you any of several sizes of food grade icing buckets, that seal pretty well. If you need more depth than a 5 gallon bucket, get a Rubbermaid, food grade Brute at Loews or Home Depot. Pour a little Kmeta in the bottom, put your tubing in the bucket and close the lid. If you keep your tubing in this container when not in use, and replenish the Kmeta from time to time, you won't have any problems with mildew or anything else growing in your tubing.
With Kmeta, it's the fumes that sanitizes.