Replace hard brush with soft sponge
The cleaning products (two brushes, two drying aids, and cleaning tablets) are easily identifiable. I wish the pictures in the instructions were larger. Also, I was unsure how to get the tube brush into all the parts of the tube.
Good to know that Camelback approves the use of the brush material as I wouldn't want cleaning to impact the longevity of the reservoir.
Bottomline: Good stuff, especially if you're willing to interpret and develop your own uses for the brushes.