Black Streaks on Gutters

Does anyone know how to get rid of those black streaks on gutters? I tried pressure washing, bleach, Krud Kutter, soap… No luck.
Any help would be greatly appreciated.

Thank you all!

Louie Ruiz
Superior Window Washing

Google “gutter brite”. Best stuff out there.

I use simple green pro HD. It’s a purple color available at Home Depot.

Sent from my iPhone using Tapatalk

Hmm, I recently did gutters with the black streaks (tiger striping) using Krud Kutter full strength and a white scrubbing pad. It came off easy with a little back and forth scrubbing then wiping clean with a large rag. I did it in full sun so could only do about two feet at a time to keep it from drying before wiping.

Is the gutter vinyl or aluminum?

Wow that’s to much work. Get some gutter grenade and a 10" truck wash brush. Brush it on let it dwell a couple minutes brush again and rinse it off. Use an extension pole on the brush and you can do 50’ of gutters in 10 minutes.

No dwell time with gutter brite. Just gently apply with a scrub brush and rinse. Little effort and cheaper than F13. Works 300% better imo.

We’ve had success using Sprayway and a magic eraser.

Sent from my iPhone using Tapatalk

Aluminum.

My thing is I really want to use something environmentally friendly. It wasn’t that much work really with the Krud Kutter. Scrub it on/wipe it off. Scaffold type ladder and I worked it moving the ladder three times.

I have found that the best thing is always Magic Erasers. The other thing that could be happening if they are aluminum is wear / color fade / signs of age showing.

Thank you , I just ordered some I assume this is what you were referring to: The Original Gutter-Brite streak and stain remover

are you working from the ground or getting up there with ladders ?

Thats the stuff. Sometimes don’t even need to scrub, just pump spray on and hose off.

Awesome, thank you!

Gutter Grenade also known as f13