I have been using Koh for some time now. I cannot say how impressed we are with ALL of the products. I have seen some negative comments online about Koh, but I have recommended it to my friends and explained that they MUST watch the videos to ensure you use them as they show (ie spray and leave it to dissolve grease) and you will get GREAT results. I love the universal cleaner on my jewellery too, makes it sparkle... you will be amazed at what it gets off your jewellery!! Thanks Koh for great products that do NOT aggravate my asthma!