I've been using the Kent Microfibre Noodle Wash Mitt for some time now and this is a product I find really hard to fault.
One of the first rules of car detailing is to stop using a traditional 50p sponge. Why, I hear you ask. Well a sponge is actually more coarse than you might think, rub one against your arm and you quickly feel it start to itch, now imagine if your arm was covered in dirt and dust (I hope it isn't ;-) ) and you can imagine how swirls and scratches can appear in your paint.
The Kent Microfibre Noodle Wash Mitt has microfibre noodles which make sure dirt is drawn up into the sponge and away from your paint. Coupled with the fact it's a mitt so it's comfortable to use and it also retains a good amount of suds meaning less trips back to the buckets.
The Kent Microfibre Noodle Wash Mitt can be bought for well under a fiver and is a great wash mitt. Also available in many colours, I seem to like the bright green ones!