Snake Oil!

i heard once on a port fuel injected motor they cleaned the carbon off the valves and when they did it all the sludge and carbon went into the cylinder and it hydro locked the engine like half way up on the compression stroke and it bent the rods at severe angles and in multiple places. sounded way bad. because of this kinda thing i am hesitant of putting 'quick' cleaners in my motor. i like the 'bg44k' cleaner for the fuel because it works good and takes a little longer. thats not for lifters but something like that sounds a little safer to me.