On what thread is it "indicated and confirmed by the hotel house keeping department that many SPG and Marriott properties will wash used slippers at guest room and pack it again for the next guest to use" and where is that information posted? What/who are the confirmed sources? Are we to believe housekeeping purchases new cellophane wrappers in which to repack these or are they fishing the old cellophane out of trash cans to reuse? This seems unreal, almost as if someone is trying to spread a vicious rumor. Proof, please?
ADDED:
This thread is over five years old. It mentions a single SPG hotel where some people assumed the slippers were reusued because they were fancier than the norm, but even at that property, those who took the slippers were not charged. There is also nothing about the slippers being repacked to make them look new. That is a single property, not "many" as is alleged in the first post here.