Does anyone have these? I had them laid earlier this year and they're driving me insane. They look so greasy after cleaning, leaving footprints everywhere, literally looks like someone's smeared butter on the floor. For a short while I found the best way was glass cleaner & microfibre mop, then every so often a good scrub on my hands/knees with kitchen roll/glass cleaner.... but for some reason it's started doing this again. I had them sealed when laid & scrubbed them at that point to remove the initial residue they come with. I've tried 'polished porcelain' cleaning solution, was even worse than the glass cleaner. Have tried water, water/fabric conditioner, water/fairy. HELP!