I wasn't claiming them to all be only on the surface and am fully aware of systemic and nonsystemic properties. Was just pointing out the diff in IWE(wash/sieve) and BHO(rinse/evap) and the tendencies to concentrate indiscriminately. I see now that I should have been more specific.
I think that the bigger point is that they speculate the IWE makers are pickier and care about what is in their starting material more than BHO makers. This may be true to some extent.
I am under the impression that microbial testing is for the microbes(fungus and bacteria) and mycotoxins not for the fungicides and insecticides.
" Spinosad is a mixture of chemical compounds in the spinosyn family that has a generalized structure consisting of a unique tetracyclic ring system attached to an
amino sugar (D-forosamine) and a neutral sugar (tri-
Ο-methyl-L-rhamnose).
[2] Spinosad is relatively non-polar and not easily dissolved in water.
[3]"
-Wiki