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How to Clean a Napoleon Grill (Wave Grates and All)

Napoleon's wave-pattern grates and premium build mean specific cleaning considerations. Here's the routine for any Napoleon Prestige, Rogue, or Mirage model.

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Published March 17, 2026 · 3 min read

Napoleon grills are built well. The Prestige line in particular is comparable to Weber Summit in quality, with Napoleon-specific features like the wave-pattern cooking grates and integrated rotisserie capabilities. The cleaning routine reflects the build — periodic attention to the wave grate channels, otherwise standard gas grill maintenance.

What’s distinctive about Napoleon

Wave-pattern cooking grates: the signature feature. The undulating pattern is great for searing — each wave crest contacts food directly while the troughs catch drippings. The trade-off: more surface area where grease can accumulate.

JETFIRE igniter: Napoleon’s hot-tip igniter system is generally more reliable than push-button igniters on cheaper grills. Less frequent replacement needed.

Premium build quality: heavier-gauge steel, better welding, longer-lasting components. Cleaning effort similar to other premium grills (Weber Summit-tier); component lifespan generally longer.

Integrated rotisserie: many Napoleon models include or support a rotisserie. The rear infrared burner used for rotisserie has its own cleaning needs.

After-cook routine (5 minutes)

  1. Brush the wave grates while warm — work the brush into the troughs of the pattern
  2. Quick visual check of the grease pan
  3. Close the lid

Monthly routine (15-20 minutes)

  • Pull wave grates and sear plates
  • Soak wave grates in hot water with degreaser (the wave geometry benefits from soaking more than flat grates do)
  • Wipe sear plates clean
  • Vacuum the firebox channels
  • Empty the grease pan; replace foil liner if used
  • Reinstall and verify

Twice-a-year deep clean

In addition to the monthly steps:

  • Full disassembly including burners
  • Pull burners and inspect venturi tubes
  • Deep-clean the rotisserie burner if applicable
  • Clean the cabinet exterior (Napoleon’s enameled and stainless finishes are good quality but benefit from periodic attention)
  • Inspect propane connections, regulator hose

Napoleon-specific issues

Wave grate seasoning loss. Cast iron wave grates can lose seasoning faster than flat grates because of the contact patches. Re-season periodically with a thin oil layer and high-heat run.

Sear plate warping. Possible after years of high-heat searing. Replacement sear plates are available from Napoleon.

Rotisserie infrared burner. If you don’t use the rotisserie often, the infrared burner can develop dust accumulation. Run it briefly during your monthly clean to burn off accumulation.

Side burner cleanup. Napoleon Prestige models often have a side burner. Standard gas burner cleaning rules apply; don’t forget it during monthly maintenance.

Lifespan

Premium Napoleon models (Prestige, Prestige PRO) routinely last 12-15 years on regular maintenance. Lower-tier (Rogue, Mirage) models run 8-10 years. Replacement parts are widely available; Napoleon’s parts ecosystem is one of the better ones.

Frequently asked questions

Are wave grates harder to clean than flat grates?

Slightly, in terms of surface area. But the wave pattern responds well to soaking — a 30-minute soak in hot soapy water lifts most accumulated grease without aggressive scrubbing. Net effort is comparable to flat grates if you use the soaking approach.

Can I use the wave grates without seasoning them?

Cast iron wave grates need seasoning for non-stick performance and rust prevention. Stainless wave grates don't need seasoning but benefit from periodic oiling. Check your specific model's grate material.

How often should I replace my wave grates?

Cast iron grates: 8-12 years if maintained, less if rust takes hold. Stainless wave grates: 12-18 years for most owners. Both are model-specific replacement parts; verify dimensions before ordering.

Why are my Napoleon's flames yellow on one burner?

Same diagnostic as any gas grill — most often spider webs in the venturi tube ([dedicated guide](/grill-care/spider-webs-in-grill-burner-tubes)) or clogged burner ports. Pull the burner, inspect, clean. The fix is the same regardless of brand.

Do Napoleon parts last longer than Weber parts?

Roughly comparable on premium models (Prestige vs. Summit). Napoleon's wave grates last about as long as Weber's flat grates with comparable care. Burners, igniters, and gaskets have similar replacement schedules across both brands.

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Topics: Brand Guides