engineRemoveShader.. is not removing the shaders

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Hi, I want to remove every smoke from the car, engine smoke, explodion smoke, etc. 
My question is why just not removing the smoke? 

texShader = dxCreateShader ( "texreplace.fx" )

function removeSmoke()
	engineRemoveShaderFromWorldTexture(texShader,"collisionsmoke")
	engineRemoveShaderFromWorldTexture(texShader,"smoke")
	engineRemoveShaderFromWorldTexture(texShader,"smoke5")
	engineRemoveShaderFromWorldTexture(texShader,"smoke4")
	engineRemoveShaderFromWorldTexture(texShader,"smokeII_3")
	engineRemoveShaderFromWorldTexture(texShader,"fireball6")
end
addEventHandler("onClientResourceStart", root, removeSmoke)