I bought a pack of 3 thicker-than-normal microfibre cloths at Poundland to try as booster. They work great! They come in a box of 3 (yellow, blue, pink) at for £1. Like I said, they come in a box rather than the ones that are loose. They're a bit wide, so they need to be trimmed because they're too thick to fold in half. I can't believe what a bargain they are! I only bought one box but I'm headed back for more.