Scott
You`re right Colgate`s German FS is called "Softlan"
I`ve googled "Final Touch" and found out that it used to be a Unilever product before they sold the brand so I assume it is compareable with Snuggle, Kuschelweich and Comfort.
The absence of any residue in your sink and no build up on clothing can be explained with the presence of nonionic surfactants, which Unilever seems to favor along with the usual cationic surfactants in all their FS.
Let me guess, does Final Touch also leave towels more absorbant than others ? I guess it does.