"Really not bad" star star star star_border star_border The instructions on the bottle were unbelievably opaque “leave for a while” “leave longer” which was very frustrating. It is also frothy rather than a stiff foam: it will run down any surface immediately and not linger well on vertical surfaces. I found that it didn’t stretch very far; half a bottle in one use didn’t even cover all the areas needing treatment. The smell is much more pleasant than others, and less irritating than all natural choices like white vinegar. I did find it fairly effective leaving for hours on the flatter surfaces. Lara - 15 April 2021 support_agent A note from the team Thank you for your review. We're pleased you found it to be effective, however we'll be sure to pass your feedback about the instructions along to our Buyers.