Custom Attributes , no idea how to remove

[A娘]

I get a model with this custom attribute , tried any way i known , can't remove it 
someone please try this , thanks

the file was max 2020 version

[denisT.MaxDoctor · Accepted solution]

deleteitem meditmaterials.custattributes 1

[A娘]

worked
i lost the method $.custattributes , now get it
thank you