Better than ANY sponge.
A good microfiber cloth is superior in every way when cleaning table tennis rubber.
The old way:
Traditional table tennis sponges smear grime and grit around on your rubber surface resulting in small scratches, producing decreased rubber life and performance.
The new way:
A microfiber cloth can be lightly moistened and the bat can be swiped in one stroke, leaving all the dirt behind not grinding it into the rubber. Simply lay the cloth flat across your leg swipe the bat from handle to tip one time and it is cleaner than you would ever get with a sponge. To ensure the best results use a slightly different place for each cleaning, you will see a line if grime and grit will be left behind, (This is what would have been ground into your rubber using a sponge and a traditional circular motion.)
* ANY microfiber cloth will work better than a sponge, if you already have one laying about the house clean it well and use it.
Cloth color is random. Size is approximately 11 x 11.