I've tried this dry cleaners for suits and have been very happy! (Especially since they're only charging CHF 8 per item (doesn't matter if it's a jacket or trousers). This was the cheapest place I found and it's near Schmiede Wiedikon. The turn around time is about 3 days.

Clean Point AG, Zürich
Textilreinigung
Zweierstrasse 139
8003 Zürich