Ultegra vs 105...chains and cassettes

And as far as the chains go, the treatment is applied to the metal and doesn’t “wash out” once you’ve cleaned the chain (think of it like Teflon coating on a frying pan). It does however give certain waxes a hard time adhering if you’re doing that stuff. That said my DA chain has no problems with Silca Super Secret, and I think their Synergetic is fine with it too (that’s the one they recommend for gravely dirty stuff)