Hey. I just landed my first roof job. I cleaned roofs for another company last summer so I have some experience but not enough, I only helped out on a couple jobs. This job I landed has a fairly steep roof (not one that I'm comfortable walking) and it goes up pretty high. It's one that doesn't go back down at the mid-point of the house. It goes up for about 3/4 of the house and then down again. It has some green mold or algae on the top corner. I've been doing a lot of searches and hear a lot of you talking about walking the roof, is this a necessity or just the quickest way to get the job done. I can probably get a few feet above the gutters with a ladder and figured that after applying the chemicals I could blast the algae away with a garden hose but, it'll be about 10 ft. or maybe less away from me. Any advice?