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I thought this about my local parlour. The covering is a brown silk sheet and they give you a grey towel to go ontop. I have serious concerns for their hygiene policy but OMG they give the best massages ever!! I completely forget about it within 30 seconds. I just shower when i get home.
I think they only have to use paper towel to wipe cum off the table.
My masseuse cleans the table with disinfectant right in front of me so I can see and then puts a towel on top.