How to Clean and Maintain an EarthStone Oven

What EarthStone ovens are and why they need different care

EarthStone ovens are wood-fired or gas-fired clay and brick ovens built with natural materials that absorb and radiate heat evenly. Unlike metal ovens, the porous clay body and brick dome retain moisture and can be damaged by harsh chemicals, high-pressure water, or sudden temperature changes. If you own one—whether it's a residential model or a commercial unit—the cleaning and maintenance routine is simpler than you might think, but it follows different rules than a standard kitchen oven.

The key difference is that EarthStone ovens are designed to be self-cleaning to a large degree. The high heat (typically 700–900°F for wood-fired models) burns off food residue and grease during normal use. Your job is not to scrub the interior aggressively, but to protect the clay and brick from damage and keep the oven functioning safely and efficiently.

Key Takeaways

• Never use water, vinegar, or chemical cleaners inside an EarthStone oven—they damage the porous clay and brick and can cause cracking.
• Ash buildup should be swept out with a soft brush or removed with a metal ash shovel after the oven cools completely.
• The exterior clay body can be wiped with a dry cloth or very lightly dampened cloth, but avoid soaking or spraying water directly on it.
• Inspect the dome and floor for cracks or damage after heavy use or seasonal changes, as thermal stress can open small fissures.
• Allow the oven to cool slowly after use—do not spray it with water or expose it to cold air, which causes thermal shock and cracking.

Removing ash and debris safely

Ash accumulation is normal and expected in wood-fired EarthStone ovens. After each use, once the oven has cooled to a warm (not hot) temperature—usually 2 to 4 hours after the fire dies down—use a soft-bristled brush or a metal ash shovel to gently sweep ash toward the front opening. Push it out onto a metal ash pan or bucket placed at the oven entrance.

Do not use a vacuum cleaner or high-pressure air blower, as these can force fine ash particles into cracks and damage the interior surface. A simple hand broom works best. If ash has compacted on the floor, use the edge of a metal shovel to gently loosen it before sweeping. For gas-fired models, follow the manufacturer's instructions for your specific burner configuration, as ash removal may differ.

Check the oven floor weekly during heavy use. A thin layer of ash (about 1/4 inch) is fine and actually helps insulate the floor, but thick buildup (more than 1 inch) should be removed to prevent uneven heating and potential damage to the floor surface.

Cleaning the exterior without damaging the clay

The outside of an EarthStone oven is finished with a natural clay coating that can be stained by weather, soot, or food splatter. To clean it, use a dry microfiber cloth or soft cotton cloth and wipe gently. For stubborn marks, dampen the cloth very slightly with plain water—not soaking wet—and wipe the spot. Immediately dry the area with a clean, dry cloth to prevent water from soaking into the clay.

Never spray the exterior with a garden hose or pressure washer. Water penetrates the porous clay body and can freeze inside during winter, causing the clay to crack and flake. If your oven is in a wet climate or exposed to heavy rain, consider installing a protective cover or shelter above it to shed water away from the dome and sides.

For the metal components—hinges, handles, thermometer, or metal trim—use a slightly damp cloth and dry immediately. If rust appears on metal parts, a fine steel wool pad or a rust-removal product designed for outdoor metal can be used on those parts only, never on the clay or brick.

Inspecting for cracks and thermal damage

EarthStone ovens are built to withstand high heat, but the natural clay and brick can develop small cracks over time due to thermal cycling—the repeated heating and cooling that happens with regular use. Inspect the interior dome and floor every few months, especially after the first year of use when the oven is still settling.

Small hairline cracks (thinner than a pencil line) that do not grow are usually not a concern and are part of normal aging. However, if you notice a crack that is widening, a section of the dome that is spalling (flaking off in chunks), or cracks that form in a pattern, contact EarthStone or a may have access to oven technician. These may indicate a structural issue that needs repair before the oven is used again.

Cracks often appear at the junction where the dome meets the floor or around the oven opening, where stress concentrates. Take a photo of any new crack and date it so you can track whether it is growing. If the oven is used heavily (several times per week), inspect more frequently.

Protecting the oven from thermal shock

Thermal shock—rapid temperature change—is the leading cause of cracking in clay and brick ovens. Never spray water on a hot oven, even to cool it down quickly. Never open the door suddenly to a cold wind or leave the oven exposed to rain immediately after use. These actions force the outer clay to contract faster than the inner mass, creating stress that cracks the material.

After cooking, close the door and allow the oven to cool naturally over several hours. If you need to use the oven again the next day, let it cool completely overnight. If you live in a cold climate and use the oven in winter, cover it with a weatherproof tarp or shelter to prevent rain and snow from hitting the hot dome. In summer, shade helps too, as direct sun on a cooling oven can also cause uneven contraction.

If you accidentally expose the oven to thermal shock and notice a new crack, stop using it and let it cool completely before inspecting the damage. Small cracks may seal themselves as the oven cools and the clay contracts, but larger cracks or spalling require professional repair.

Seasonal maintenance and storage

If you live in a climate with freezing winters and your EarthStone oven is outdoors, prepare it for the cold season. Make sure the exterior is as dry as possible before winter arrives. If water has soaked into the clay, it will freeze and expand, causing surface damage. Use a weatherproof cover or shelter to keep snow and ice off the oven during winter months.

In spring, inspect the exterior for any flaking, cracks, or areas where the clay coating has worn away. If bare brick is exposed, it will absorb water more readily. Some owners apply a breathable, water-repellent sealant designed for clay and brick, but check with EarthStone first to confirm which products are safe for your model. Never use a plastic or non-breathable coating, as trapped moisture will cause more damage.

If the oven will not be used for several months, clean out all ash, close the door, and cover it. Do not seal it airtight—the oven needs to breathe. A loose tarp or weatherproof cover is sufficient.

When to call a professional

Most routine cleaning and inspection you can do yourself, but certain repairs require a professional. If the dome has a large crack (wider than 1/8 inch), if chunks of clay or brick are missing, if the floor has developed a deep depression or uneven surface, or if the oven is leaking smoke from the sides rather than the chimney, contact EarthStone customer service or a certified oven technician.

Repairs might include patching cracks with specialized clay mortar, replacing damaged bricks, or resurfacing the interior. The cost and complexity depend on the damage, but addressing problems early prevents them from worsening. EarthStone provides repair kits and guidance for minor fixes, and their website lists authorized service providers in many regions.

Frequently Asked Questions

Can I use a commercial oven cleaner inside my EarthStone oven?

No. Chemical cleaners, degreasers, and oven sprays will damage the porous clay and brick, discolor the interior, and may leave residues that affect food flavor. Stick to dry brushing and ash removal only. The high heat during normal cooking burns off food residue naturally.

My oven smells like smoke even when it is not in use. Is that normal?

Some smoke smell is normal, especially in new ovens or after heavy use. However, if smoke is leaking from cracks in the dome or sides rather than exiting through the chimney, the oven may have structural damage. Inspect the dome and floor for visible cracks and contact EarthStone if you find any.

How often should I use my EarthStone oven to keep it in good condition?

Regular use is actually better for the oven than long periods of inactivity. Frequent heating and cooling in a controlled way helps the clay and brick settle and stabilize. If you use it weekly or more, inspect it monthly. If you use it occasionally, inspect it seasonally or before each use.

What should I do if water gets inside the oven during a rainstorm?

Allow the oven to dry completely before using it again—this may take several days depending on humidity. Do not attempt to dry it with heat or fire, as rapid drying can cause cracking. Once dry, inspect the interior for any new cracks or damage before resuming normal use.

Can I repair a cracked dome myself?

Small hairline cracks that are not growing can be left alone. For cracks wider than a pencil line or cracks that are spreading, professional repair is recommended. EarthStone sells repair kits with instructions for minor patching, but structural cracks in the dome are best handled by someone experienced with clay and brick oven repair.