It is a good idea to wash your ringsling before first use. It fixates the threads so they do not shift. Also, washing (and ironing) are the first steps to soften your ringling. Beastly wraps will be hard to use in the beginning.
The rings of a ringsling can get damaged during the washing proces. You can prevend them from scrubbing to each other by putting a washcloth around them so they cannot move. Also you can put the ringsling in a (tied) pillow cover in the washing machine.