Student or Learner
What does washing and offering mean?
And what does washed but not offered mean?
It could be that you have just seen something like this:
"Bring your car to Krettin's car wash and valeters. We are a professional car wash and offer a great service at very affordable prices."
Thi,s of course, simply means, "We are a professional car wash establishment, and we offer a great service..."