Certainly not for any substantial length of time whilst the party is still ongoing. Once people have retired for the night it will be easier to assess how much cleaning will be required, since I cannot honestly say how prepared the party planners are to clean up after themselves.
[He hopes they'll be some semblance of responsible, but who knows. As a hotel employee, anything left to do will be Sebastian's job to take care of, after all... Give him a moment to realise she's actually enthusiastically volunteering to clean.]