I’ve had the Gutter Helmet type for 15 years and have never had to clean out a gutter. These are the ones with the solid cap over the top and then the curved lip that feeds the water around the edge and into the gutter. Only water can follow that curve around, leaves, seeds, snow, etc just slides off and over the edge.
We have a lot of maple trees taking a giant s!it of helicopters/seeds on us every year and I used to have to hose out clogged gutters that smelled like pig sh!t twice a year. Have not done it once in 15 years since installing the guttter helmets.
There are other versions of this brand but the point is they do not have strainer holes on the top that also get clogged.
Grouse