Suburban Furnace exterior vent types (with pic)

Does the Suburban furnace need wire-brushing once a year after use to keep it clean? Mine's 13 years old, and I've never cleaned it's interior grates.

Used to have a Vogue in the 1980s, and the furnace needed a good wire-brushing annually.

I've never pulled mine completely out except to reach in and around the interior to get at the mud dauber wasp nest because I didn't have the dual-screens installed on the outside of the unit.