Anyone recommend this? Ive read it can be done by squirting it into vacum hoses or the intake while the engine is running and just before an oil change.
My car pings occasionally under full throttle(only happens breifly then not again for a while, I assume thats the knock sensor doing its job).
Thats with PULP or LPG and standard compression/timing etc, im a little mystified so I thaught a good cleanout could do the trick.

the ford inline 6 has a knock sensor?? i didnt think it did ??

Yep, from EF onwards.

Located at the top of the block, around Cyl 5.