self-service laundry in Zermatt?

I don't know of personal knowledge but I'm a dab hand at google.

Have a look at the two results on
http://yellow.local.ch/de/q/Zermatt/W%C3%A4scherei.html

Rick's Switzerland book (pp. 218-9) lists Waschsalon Doli (20 euros/load for their wash&dry service, may or may not offer self-service, closed Sun) and Womy Express in the Victoria Center mall (closed Sat & Sun, no notes on service options).

Doli is the first one in the link I provided.

Thanks for the help. I decided to stop at the self -service laundry next to the hostel in Lauterbrunnen before leaving for Zermatt. The laundry in Lauterbrunnen was great - clean, English instructions, soap included, 5francs per wash and 5 for the dryer. It is the one in Rick 's book.
I just walked by Womy in the Victoria mall in Zermatt. It is drop off and dry clean only.