If you got some credits to burn or just want to clean your hands in style, then Nintendo has your back. In a recent update to Club Nintendo Japan a series of hand cloths were added. A total of 5 designs were added, which have designs from Mario, Animal Crossing and oddly enough Rhythm Heaven.
Currently the cloths are only 300 each, so you might want to consider one. Sadly these have not been announced for the US version, but ideally we will get them at some point this year.