Did a search, really couldn’t get a direct answer.
I’ve had several customers ask me to clean their gutters and soffits. It’s usually dirt from those stupid gutter helmets, but I’m not looking to use a wand on a ladder. My xjet gets some off but probably not what they were hoping for.
My wife found that Krud Kitter for gutters, any other ideas?
Change up your search words and try again. There is enough reading on that subject to keep you busy all night
Most vendors will have commercial grade gutter cleaner . Be carful it will take the paint off . Amazon sells chomp a consumer grade
Try “tiger striping”. 
When you do find that gutter cleaner in your search…make sure to test your dilution when mixing it on your own gutters first. I dialed it up too hot the first time and took the paint right off. Of course I tried it on the gutters facing front where everyone can see. Glad I didn’t try on a customers house though. Now I have the perfect solution for the gutter cleaner you’ll find in the search bar.
I may have to pass on this job, 3500sq/ft house, 2.5 stories in the back, owner wants “all white areas on house cleaned”…ie window frames, gutters etc.
Charge them as much as you would for gutter cleaning and whole house wash. Then if you get it… Cool. If not, cool too. I,ve used f13 on gutters with hit or miss success rate. And yes it will take paint off if you’re too agressive with it. If its cool at all outside ive found f13 won’t work too well. Just my limited experience with it.
