what one FI cleaner has trouble dissolving
another brand of FI cleaner might successfully handle,
and vice versa
so mix it up and don't use the same brand every time
is my philosophy,
and there was an article in Motor Magazine years ago that recommended the same mix it up strategy

http://web.archive.org/web/20000818062832/http://www.motorage.com/edindex/0600pg032.htm

more on FI cleaner opinions at Moparts in the past

https://board.moparts.org/ubbthreads/show...rue#Post2774863