how do you clean the grease drain hole on the flat top? mine is completely clogged after one cook.

Diagnosis

The blockage in your Blackstone 28-inch Griddle with Air Fryer is caused by "carbonized sludge"—a mixture of burnt food particles, high-smoke point oils, and solidified fats that have bonded to the cold steel of the grease trough. Because the drain hole is the lowest point of the cooking surface, it acts as a collection basin. When you shut down the griddle, the remaining oil cools and thickens, trapping debris and creating a waterproof seal that prevents future runoff. This is often exacerbated by the factory-installed rubber stopper. While intended to prevent spills, the stopper creates a stagnant pocket of grease. If you used a heavy amount of oil for the initial seasoning process, the excess oil can pool in the drain area and polymerize into a hard, plastic-like resin that resists simple scraping. You can confirm a total clog if you pour a small amount of water on the surface and it pools around the drain rather than flowing immediately into the grease cup.

How to Fix It

To clear the drain and restore proper flow, follow this thermal-mechanical extraction process:

1. Clear the Obstruction: Reach under the griddle and pull the rubber drain plug completely out of the hole. If the plug is stuck due to hardened grease, use a pair of needle-nose pliers to gently wiggle it free.
2. Thermal Softening: Ignite both burners and set them to medium-high heat. Let the griddle surface reach approximately 350°F to 400°F for about 10 minutes. This liquefies the congealed fats and softens the carbonized debris.
3. Mechanical Scraping: Using a heavy-duty stainless steel putty knife or a Blackstone-branded griddle scraper, apply firm pressure to the grease channel. Scrape from the outer edges of the griddle surface directly toward the center of the drain hole, pushing all debris into the opening.
4. Steam Flush: While the surface is screaming hot, carefully pour 1/2 cup of water directly into the clogged drain hole. The water will instantly flash-boil into steam, creating a high-pressure burst that forces the remaining sludge through the hole and into the grease cup.
5. Final Clear: Use a pipe cleaner or a rolled-up piece of heavy-duty aluminum foil to poke through the hole and ensure no solid chunks of food remain lodged in the narrowest part of the aperture.

If That Didn't Work

• Chemical Degreasing: If the clog is a hardened resin from over-seasoning, apply a small amount of concentrated citrus-based degreaser or a paste of baking soda and water directly to the hole. Let it sit for 30 minutes to break the chemical bond of the carbon, then scrub with a stiff nylon brush.
• The "Hot Water Pour": Boil a full kettle of water. With the griddle off but still warm, slowly pour the boiling water directly into the drain. The sustained heat and volume are often more effective at flushing a deep clog than a quick steam flash.
• Physical Reaming: Use a 1/2-inch diameter drill bit (held by hand, NOT a power drill) or a sturdy metal skewer. Gently rotate the tool inside the drain hole to carve out the blockage. Be careful not to scratch the seasoning of the flat top surface around the rim.
• Full Deglaze: If the entire channel is coated in thick sludge, pour a thin layer of water across the entire griddle surface while hot, then use a pumice stone or a griddle scrubbing brick specifically on the drain area to mechanically grind away the carbon buildup.

Heads Up

• Grease Cup Maintenance: Always ensure the grease cup is empty and the liner is clean before starting a cook; a full cup creates backpressure that prevents the drain from working.
• Avoid Over-Oiling: During the seasoning process, use a paper towel to wipe away excess oil from the drain channel. Too much oil in the trough leads to "pooling" and faster clogging.
• The Post-Cook Flush: Make it a habit to scrape the griddle surface toward the drain while it is still hot at the end of every session to prevent debris from settling and hardening.
• Plug Management: Only use the rubber plug during transport or when the griddle is completely cold. Never leave the plug in during the cooking or cleaning process.