the green crud is protecting the bronze
from further corrosion
. unless it's really making you nuts dont't bother, it'll be back anyway.
For the hose.......well, if the hose is in good shape, not adhesied (sp) to the tube, and is long enough, and you don't mind getting wet, and feel that this is something you want to try.......go for it.
The potential pitfalls are a dried out hose cracking while you mess about in your slip far away from a travel lift
and unable to stem the flow of water
. Then again the hose could be new, and just as you guessed it will just slide further onto the tube to take both clamps.