I never said don't use ubik, i was sharing my knowledge and experience of using cleaners that are based on sodium hydroxide over many years and pointing out that yes these type of harsh and aggressive cleaners can dull the factory finished sheen on pvc surfaces, after all this is a forum where members share knowledge and experience with each other. If you look at many of my posts i always share that there are many janitorial suppliers in the UK who can offer safer alternatives. I realize that if we had a shopping cart on our site that yes more guys on here may give some of our products a go and see if they meet their needs.Believe me i am working on this and will have a shopping cart back up over the next few weeks, i say back up as we did have one before but for reasons which i can't go into i had to take it down. Just on all the waffle Dave, when i say good quality/high performance microfiber cloths it dose not mean it has to be little waffle glass cloths, as again there are many suppliers in the Uk who do provide good quality/high performance microfiber cloths. i even shared one who also promote little waffle weave glass cloths and again for others who would like to know its ecloth one of the largest suppliers of microfiber in the UK and who carry an excellent range of microfiber. So don't worry guys its not always about sales if it was i would have a shopping cart up a long time ago. So back to added sparkle i have shared from my experience that using good quality/high performance microfiber cloths with plain water will leave a natural shine and sparkling finish on glass. So i have no problem in saying that you don't always need to use additives to make glass sparkle, what do others think.