You can buy silicon remover, squirt some of that on the end of an old applicator and work on it that way, assuming you have poles?
No guttering that I know of is strong enough to take the weight of a person, even if the glass is, you have to be so carefull once the glass is wet, it becomes like an ice rink you could so easily slip off, or go through the roof.
use a ladder, and pole from there, if you have plenty of conservatory roof work invest in a conservatory roof ladder.
STAY SAFE