Not sure how your using it but I use it a lot and while it will not remove everything, everytime, it can be a real time saver on some jobs.
I've been in and out in 30 minutes on some jobs where it's just a fresh wine stain. On tougher jobs I have applied it ,left it and returned another day to remove the stain. Sometimes it will not take it all out but enough to satisfy and on others it does not work at all and you have to go down another route and start upping the strengths applied.
What it won't do is any damage! so always start with it first.