By the way, Sticky No More is NOT a product that you apply, but a service company that has a process to fix the soft touch knobs and interior pieces prevalent in European vehicles. Obviously, you remove your troubled pieces and sent them to them for repair for a fee.
Those of you detailing professionals that see these hi-end cars with such problems KNOW that this service is probably the only true way to resolve this issue, short of an expensive placement part that will only succumb to the same problem again in the future.
Makes you wonder WHY these vehicle manufacturers just do not contact Sticky No More and have them coat OEM parts to begin with or buy the process from them so they can do it in-house if need be! Guess that makes too much sense.
Kind of off base with this vinyl sun visor deterioration issue, BUT do oils and sweat from human hands contribute to the demise of this soft touch knob material. I ask because as a mechanical design student MANY years ago, we visited a tool and die design-manufacturing shop and the tour guide stated that they measure the acidity of a tooling machinist applicant and if it is too high, they do not hire them because of the potential corrosiveness to the tool steels used in precision dies from their hands. Never thought of this, but my glasses frames do get corroded from my facial oils and sweat over time, and I am sure that this varies from person-to-person.
I also assume that cleaning the soft touch knobs on a regular basis will prolong the life of such material, BUT it will not prevent its inevitable demise.
To get back to sticky vinyl problems, I have seen this phenomenon on dash boards of vehicles that the drivers were smokers and not cleaned very often. it seems that the tar and nicotine "ate" the vinyl material and caused them to become sticky. Smoke residue is sticky by nature anyway. Prior to discovering Megs Detailer Line APC and Optimum`s Power Clean from this forum, my go-to cleaning product for smoke-covered vinyl was strong soapy ammonia cleaners or powder Spic-and-Span with its tri-sodium phosphates, which did not help the elasticity of the vinyl and probably only contributed to that sticky feel. As a younger man when Armour-All protectant first came out, I thought this was the "cat`s pajamas" for vinyl care and it was head-and-shoulders over the Pledge furniture polish I was using (Young and ignorant, but word-of-mouth was our social media way back then). However, as I heard by more word-of-mouth, its early formulations discolored light-colored vinyls over time. Its formula was changed and I used AA for many years until Megs came out with their Classic Line vinyl protectant and have since moved up to 303 discovered from this forum.