We've used Right Hand Inc to clean multiple residences, as well as one-off realty listings for over a year. The quality and professionalism of the staff is second to none, and just as importantly, they are very trustworthy. I never give a second thought to them being alone in my home - something I cannot say about most cleaning services I've used in the past.
Carol, the owner, is great - she's extremely accommodating to changing schedules or fitting those one-offs in. She also offers referral credits, so you know she appreciates her customers, which is rare these days. I wouldn't use anyone else for my cleaning needs!