A:Answer Sorry for the inconvenience, I haven't hear of anybody having that issue. Maybe there was a rest of abrasive cleaning solution left on the cloth that wasn't noticeable until it mixed with water? I wish I could help but all I can recommend is to contact LG Customer Service at (800) 243-0000 or visit the LiveChat Team at www.LG.com/us/support for assistance. If all fails and you have to fix it yourself, you could have the words printed on vinyl.
(See attachment: image from page 9 in the manual.)