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Remember what you are asking for when you get more experienced, wiser and need a good laugh.  Once you have been doing it for a while you find that do not base prices on the # of squares the hose roof has.  I not only judge it by size (sq ft foundation) but also how dirty it is and how difficult the job is (quantity of chemicals necessary to complete the job), and how long I thing it will take (time to complete).  In otherwords you speed up the estimation time so you can get on to other bids.

Job cost = (quantity of chemicals necessary to complete the job) x (time to complete).

I'd be very surprised if you could get two roofs out of 50 gallons, not to say that it can't happen. For that size house I'd bet on 40 gallons per roof. Each roof is going to clean a little differently, each roof will use its own amount of solution.

Let me give a caveat to this post...you likely could clean two roofs with a hot mix and 50 gallons with a pump up sprayer, but the time/effort would blow your profit margin.

yep thats what I meant 50 gallons of love?

Like the guys said, there are too many variables like how bad the roof is, how hot your mix is, what surfactant you are using, etc....will tell you a little bit more but I would not gamble that 50 gallons of mix would do those 2 roofs but 50 gallons of love might do it if you are making the mix weaker than a 50/50 but then again it might not clean as good.

Do you only have room for 50 gallons of love on your trailer? If so I would really try to get a larger tank when you can so it will mean larger roofs, less visits to the supplier, etc...

Good luck.