What Are Those Black Streaks on My Gutters? (And Why They Keep Coming Back)

You’ve cleaned your gutters. The leaves are gone. The water flows fine.

But the front of the gutter still looks… dirty.

Those black streaks running down the face? That’s what we call tiger striping.

 

What causes it?

Those streaks aren’t just dirt. They’re a mix of:

  • Asphalt shingle runoff
  • Air pollution
  • Organic debris
  • Water carrying everything down the roof and over the gutter edge

Over time, that mixture bonds to the surface of your gutters. Once it sets in, it doesn’t come off with standard cleaning.

 

Why they keep coming back

Here’s the frustrating part. Every time it rains, your roof is sending more of that material down.

So even if you clean it once, the process keeps repeating.

 

Why regular gutter cleaning doesn’t fix it

Most gutter cleaning focuses on function:

  • Removing debris
  • Clearing downspouts

That’s important, but it doesn’t address appearance.

The face of the gutter is a completely different job.

 

The real solution

To remove tiger striping, you need something designed specifically for:

  • Non-porous surfaces
  • Built-up oxidation and runoff stains
  • Controlled application (not blasting water and harmful chemicals)

That’s exactly why Tiger Strike Gutter Wipes were created—to target the part everyone sees.

Bottom line

If your gutters are clean but still look dirty, you’re not alone.

You didn’t miss anything.

You just haven’t treated the right problem yet.

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