Determine where the soot is coming from. The incomplete combustion from carbon-based materials causes soot. Usually, a gas-powered heating device or appliance will be the source of soot, so it’s not likely that a new refrigerator powered by electricity would cause soot. If it does, it is likely a problem from poor ventilation. Some refrigerators, though, are powered by natural gas or propane. These refrigerators are likely to have problems with soot if the gas pressure is too high or too low. Check your owner’s manual to determine what level you should set your gas.
Clean the vented area if you’re sure it’s your refrigerator that’s causing the soot. Refrigerators have vents in the back or underneath the appliance. The vents are the grates that cover the compressor. Wipe down this area adequately with a mild soap and water combination.
Vacuum the area with your vacuum’s brush attachment or a feather duster once the grate is dry.
Place the grate back on to the refrigerator.