Switch off the AC before cleaning.
Open the AC front panel and remove the air filter carefully.
Clean the filter with water and mild soap to remove dust, dirt, and smell-causing buildup.
Use a dry cloth to gently clean the visible inside front area where dust collects.
Put the filter back, turn on the AC, and check if the smell has reduced. If the smell remains strong, deeper cleaning may be needed.
Cleaning the AC filter regularly helps prevent bad smell and dust build-up.