I periodically wash my Deuter Race Air Lite hydration pack because riding causes heavy sweat buildup on the straps and zippers, eventually getting to the point where the zippers are hard to actuate. I washed it a few days ago by soaking it in a sink of hot water and sodium percarbonate (powdered OxiClean) by periodically agitating it and letting it sit overnight. This works very well, but I forgot one important step: actuating the zippers. The result is that after drying there are still some sweat deposits where the zippers had been, as seen above.
As a result the zippers are still difficult to move in these positions, so I’ll have to soak it again another day this week. Oh well, at least its winter time and I’m not using the bag on a near daily basis as I had been during the summer.