​Why you REALLY don't want to drink from hotel glasses

When you pay to stay in a hotel, it should be safe to presume that everything in your room is clean. Right? Wrong.

A study has shown that your drinking glasses may not be as clean as you would like them to be, reports the Metro.

The investigation by ABC News studied 15 different hotels across the US and found that 11 of them failed to sanitise water glasses before new guests checked in.

The Sun reports that instead of replacing dirty glasses with clean ones, many just used a towel to wipe over the dirty ones before putting them back for the next guest.

One hotel maid used a dirty hand towel to dry the glasses; the same maid then used a clean towel to wipe the dirty floor, using her foot. She then used the same towel to wipe down the coffee pot.

Workers were seen using their towels to wipe their hands before wiping the glasses.

You can always ask room service to bring you fresh glasses, and glasses wrapped in plastic should be clean.

The news comes just a few weeks after a hotel guests found a 'horror' note under his hotel room pillow.

The stomach-churning note on his bed said: "If you're reading this, then house keeping did not change your sheets."

Yuck.