Gutter guards significantly reduce the number of times you have to clear your gutters but are not capable of catching all bits of debris. This means that you still have to check your gutters once in a while. This problem is, however, an especially prevalent problem for gutter guards with large holes. They let larger than usual pieces of debris pass through the grills; allowing more stuff to collect in the gutter. Even the finest gutter guard, however, won’t be able to stop dust, dirt and tiny particles.