Your hose is just crusty on the inside from all the times you have smoked with it. It's completely broken in.
Don't wash it with water, but what you can do is blow air (compressed air or what have you) through it to clear out most of the crusty gunk. use of water in the hose will build mildew, ruin the lining, rust the wire coils, and make the cardboard (what comprises the solid handle parts) soggy and will split.
Razans are great, I would recommend putting the Km tip into the Razan and the inhale will be more controlled, instead of an in your face blast of smoke.