Is there a way to disable decals for a map?

Im making a map that uses seamless teleports, and decals kind of destroy the whole ''feel'' of the map. Is there a way to disable decals at either map-level or within vtf/vmt files? (mainly looking at explosion/bullet decals). The map already has had a few brushes turned into props to prevent hitting limits. Turning everything into some sort of entity brush/displacement and adding invisible brushes underneath isnt really an option.

Spoiler: Heres a video of what I mean

View: https://youtu.be/y_8J7-IaD9o

 

You can disable decals on individual textures by adding "$nodecal" "1" to their .vmt files.

 

This didnt work for me. I currently have:

Code:

"LightmappedGeneric"
{
    "$basetexture" "bbiniate/plasterbb3n"
    "$nodecal" "1"
    $color  "{0 255 255}"
}