I am really impressed with this stuff. The first time I tried it, I thought it sucked, but after I heard something and re-read the instructions (and yes they do say to dissolve the powder first), I now have a heap made up in an old milk bottle in the laundry and have started using it on my FB. It's great!

Just 3 washes later and I've noticed a huge difference in the lingering odors from the nappy inserts

(I had already changed to Persil, done a couple of strips, done hot washes... and my DH was complaining about the smell and nothing changing

).
So big ups to ecostore washing powder!