From the firm Zech Sauberkeit und Hygiene (Zech cleanliness and hygiene):
"Wir helfen pflegen" (we help to care).
GVS stands for Grossverbraucher-Spezialisten (large consumer
specialists). I don't know who a large consumer of such bags might be:
overweight toilet patrons, perhaps?
Thanks to Gerhad Lang (2004)