I've found the same with Persil liquid... if you use too little it rinses OK but doesn't wash, if you use enough for it to clean (or even 50ml) it doesn't rinse out at all! I've found Ariel and Bold to be better when it comes to liquid detergent, though the Persil liquids smell the nicest!
Might buy some Ariel with Febreze - only real thing that I don't like about the new Ariel bio is the smell. Rinsing was an issue for me with the Ariel Colour & Style powder, but using the Sensitive powder at the moment (along with my other regulars Bold and Persil) and the Sensitive powder seems to wash and rinse really well.
Talking fo Persil Non Bio, has anybody noticed that Persil Non Bio isn't washing as well at the moment? Previous box we had was fine but the other day I washed some sheets, and a load of towels before that both at 95*C. Both loads had bloodstains and none of them were removed, whereas the last box of Persil Non Bio did and all my other powders do too. Very bizarre!
Jon