diff --git a/src/QuantumClifford.jl b/src/QuantumClifford.jl
index 71879ee0a..b29c06945 100644
--- a/src/QuantumClifford.jl
+++ b/src/QuantumClifford.jl
@@ -993,23 +993,17 @@ end
 # Conversion and promotion
 ##############################
 
-Base.promote_rule(::Type{<:MixedStabilizer{T}}  ,  ::Type{<:Stabilizer{T}}     ) where {T<:Tableau} = Stabilizer{T}
 Base.promote_rule(::Type{<:MixedStabilizer{T}}  ,  ::Type{<:MixedStabilizer{T}}) where {T<:Tableau} = Stabilizer{T}
-Base.promote_rule(::Type{<:MixedStabilizer{T}}  ,  ::Type{<:Destabilizer{T}}   ) where {T<:Tableau} = MixedDestabilizer{T}
 Base.promote_rule(::Type{<:Stabilizer{T}}       ,  ::Type{<:Destabilizer{T}}   ) where {T<:Tableau} = MixedDestabilizer{T}
 Base.promote_rule(::Type{<:Destabilizer{T}}     ,  ::Type{<:Destabilizer{T}}   ) where {T<:Tableau} = MixedDestabilizer{T}
 Base.promote_rule(::Type{<:MixedDestabilizer{T}},  ::Type{<:Stabilizer{T}}     ) where {T<:Tableau} = MixedDestabilizer{T}
 Base.promote_rule(::Type{<:MixedDestabilizer{T}},  ::Type{<:Destabilizer{T}}   ) where {T<:Tableau} = MixedDestabilizer{T}
-Base.promote_rule(::Type{<:MixedDestabilizer{T}},  ::Type{<:MixedStabilizer{T}}) where {T<:Tableau} = MixedDestabilizer{T}
 
-Base.convert(::Type{<:Stabilizer{T}}            , x::MixedStabilizer{T}        ) where {T<:Tableau} = Stabilizer(tab(x))
 Base.convert(::Type{<:MixedStabilizer{T}}       , x::MixedStabilizer{T}        ) where {T<:Tableau} = Stabilizer(tab(x))
 Base.convert(::Type{<:Stabilizer{T}}            , x::Destabilizer{T}           ) where {T<:Tableau} = MixedDestabilizer(x)
 Base.convert(::Type{<:Destabilizer{T}}          , x::Destabilizer{T}           ) where {T<:Tableau} = MixedDestabilizer(x)
 Base.convert(::Type{<:MixedDestabilizer{T}}     , x::Stabilizer{T}             ) where {T<:Tableau} = MixedDestabilizer(x)
 Base.convert(::Type{<:MixedDestabilizer{T}}     , x::Destabilizer{T}           ) where {T<:Tableau} = MixedDestabilizer(x)
-Base.convert(::Type{<:Destabilizer{T}}          , x::MixedStabilizer{T}        ) where {T<:Tableau} = MixedDestabilizer(Stabilizer(tab(x)))
-Base.convert(::Type{<:MixedDestabilizer{T}}     , x::MixedStabilizer{T}        ) where {T<:Tableau} = MixedDestabilizer(Stabilizer(tab(x)))
 
 ##############################
 # Helpers for binary codes
diff --git a/src/linalg.jl b/src/linalg.jl
index d9b1ec0f1..638c8583c 100644
--- a/src/linalg.jl
+++ b/src/linalg.jl
@@ -194,81 +194,6 @@ julia> tensor(d, md)
 + _X
 ```
 
-Tensor product between [`MixedStabilizer`](@ref) and [`Stabilizer`](@ref):
-
-```jldoctest promote
-julia> ms = MixedStabilizer(S"-XZ//-ZX")
-- XZ
-- ZX
-
-julia> tensor(S"X", ms)
-+ X__
-- _XZ
-- _ZX
-```
-
-Tensor product between [`Stabilizer`](@ref) and [`Destabilizer`](@ref):
-
-```jldoctest promote
-julia> tensor(S"X", d)
-𝒟ℯ𝓈𝓉𝒶𝒷
-+ Z_
-- _Y
-𝒮𝓉𝒶𝒷
-+ X_
-- _X
-```
-
-Tensor product between [`MixedStabilizer`](@ref) and [`MixedDestabilizer`](@ref):
-
-```jldoctest promote
-julia> tensor(md, ms)
-𝒟ℯ𝓈𝓉𝒶𝒷
-+ Z__
-+ _Z_
-+ __Z
-𝒮𝓉𝒶𝒷━
-+ X__
-- _XZ
-- _ZX
-```
-
-Tensor product between [`MixedStabilizer`](@ref) and [`Destabilizer`](@ref):
-
-```jldoctest promote
-julia> tensor(d, ms)
-𝒟ℯ𝓈𝓉𝒶𝒷
-- Y__
-+ _Z_
-+ __Z
-𝒮𝓉𝒶𝒷━
-- X__
-- _XZ
-- _ZX
-```
-
-Tensor product between [`Destabilizer`](@ref) and [`Destabilizer`](@ref):
-
-```jldoctest promote
-julia> tensor(d, d)
-𝒟ℯ𝓈𝓉𝒶𝒷
-- Y_
-- _Y
-𝒮𝓉𝒶𝒷
-- X_
-- _X
-```
-
-Tensor product between [`MixedStabilizer`](@ref) and [`MixedStabilizer`](@ref):
-
-```jldoctest promote
-julia> tensor(ms, ms)
-- XZ__
-- ZX__
-- __XZ
-- __ZX
-```
-
 See also [`tensor_pow`](@ref)."""
 function tensor end
 
diff --git a/test/test_stabs.jl b/test/test_stabs.jl
index 0aca351bc..e5730ca66 100644
--- a/test/test_stabs.jl
+++ b/test/test_stabs.jl
@@ -64,19 +64,10 @@
             d = random_destabilizer(n)
             dmd = d⊗md
             @test mixed_destab_looks_good(dmd)
-            ms = MixedStabilizer(random_stabilizer(n))
-            mss = s⊗ms
-            @test mixed_stab_looks_good(mss)
             sd = random_stabilizer(n)⊗random_destabilizer(n)
             @test mixed_destab_looks_good(sd)
-            mdms = md⊗ms
-            @test mixed_destab_looks_good(mdms)
-            dms = d⊗ms
-            @test mixed_destab_looks_good(dms)
             dd = d⊗d
             @test destab_looks_good(dd)
-            msms = ms⊗ms
-            @test mixed_stab_looks_good(msms)
         end
     end