Removing decals on vehicles?

I've tried to make F69 VTOL lose its decals via customisation but an option "none" never appeared. I must have been doing something wrong, I guess. My question is: is it possible to remove decals via customisation after editing the files of a vehicle?
Because I've seen that it was possible to remove decals of SNG Bulldog, police car and a taxi. Now I am trying to get this working on Condor, F69, N-Forcer and tanks especially.
 
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