Ive tried it too. Ive tried two versions. I can't see any improvement in the cleaning efficacy when its added. Im being honest, its my opinion and my experience.
Ive also tried it neat on uPVC cills and it didn't do anything noticeable to the in-ground dirt. Im not saying this because I think it sells because of a placebo effect (?) Im saying it because thats my experience.
Im also not saying it because I don't like it, I'm indifferent to the product, I say it because my experience with the product shows its ineffective.