Hi Steven, i see where you are coming from with the height you are cleaning at and the cill at the bottom of the glass, there is still a safe solution though, if you take a 3 x 2mtr alum ext pole to a local metal fabrication shop that have a tube rolling machine and get them to roll the top section of the ext pole to make it like a goose neck section, then you can insert the 30cm aluminum mop frame onto the top of your pole, these 30cm mop frames have velcro strips and will grip the little waffle glass cloth which you can use to clean at your required height, then take off the damp one and put on a dry little waffle glass cloth to polish off for a streak free finish, trust me steven if you are cleaning this glass every all you will need is water with the cloths, little waffle glass cloths are 38x45cm so when one part of the cloth gets soiled just bring down the ext pole and move the cloth up to the next clean section, you can do this three times then turn the damp cloth over and you can do it three more times on that clean side, so its like having six microfiber glass cleaning pads, this would be a very handy tool to have for any interior cleaning especially when you dont want any spills or splashes, i can supply you with this complete cleaning kit from Ireland but with the fabrication and shipping costs im sure you will get it sorted locally much cheaper.