If the Smart Key does not operate normally, you can lock or unlock the door by using the mechanical key.

Move the release lever in the direction of the arrow (1) and then remove the mechanical key (2). Insert the mechanical key into the key hole on the door.
To reinstall the mechanical key, put the key into the hole and push it until a click sound is heard.
Start-up
Loss of a smart keyHyundai Kona (OS) 2018-2026 Service Manual: Liftgate Assembly Components and components location
Component Location
1. Liftgate assembly
...
Hyundai Kona (OS) 2018-2026 Owners Manual: Cleaning the upholstery and interior trim
Vinyl (if equipped)
Remove dust and loose dirt from vinyl with a whisk broom or vacuum cleaner. Clean
vinyl surfaces with a vinyl cleaner.
Fabric (if equipped)
Remove dust and loose dirt from fabric with a whisk broom or vacuum cleaner.
Clean with a mild soap solution recommended for upholstery or ...