I have a set of the Ikea Mammut table, chairs and stools. They are plastic and really funky looking. They are brilliant! It is really good quality, it wipes down easily and the chairs are so sturdy that DH & I can sit on them without worrying about breaking them LOL! I have a table, two chairs and two stools, definitely one of the best kids things we have purchased

Wooden ones would clean OK if the timber was stained. You will find they get more dents and scratches then a plastic set, but they do look lovely.

Good luck deciding!