Fenwick’s Frame & Shock Finishing Spray isn’t a polish so much as a protective spray designed for preserving seasonal machines and equipment in storage (e.g. Sunday best road bikes or summer-use-only tag-alongs).
It’s silicone free but includes a trace of lubricant, providing a showroom finish in seconds while safeguarding suspension and bearing seals. However, it does attract surface dirt more readily than furniture or car polishes and it can highlight any blemishes in flamboyant, metallic enamels and clear lacquers.
We first saw the FS foaming degreaser at the start of the year and it certainly looked like a fun new way to get your bike clean, if it can ever be fun. In practice the main benefits are the ease of use and lack of mess. It's a bit lacking in terms of raw degreasing power but a great choice for a general clean. And it's so safe you could eat it – Mr Fenwick tests all his products by eating them, apparently – although it probably isn't recommended as a regular part of your diet.