How to best educate my client, on how to take care of their dog?

I ran into a client who have little to no knowledge on how to take care of their dog. When I got the dog, the nails were twice as long as they should be. One of his paws were infected, and hes got crust all over his eyes, and I mean ALL OVER, like a circle. I tried to clean as much as I could, however, this does not seem like something that do regularly. This dog also has 0 training, jumps on everyone, doesn't know any commands, pulls the leash like crazy. This dogs here for 10 days, so I did everything I could to train, at least he knows sit now. But training and cleaning are life long commitment, which I am sure this dog is not getting (enough of).

How do you think is the best approach I can to help them out? When they come pick up the dog, what/how should I tell them? Any suggestion? I don't want to say nothing, but I also don't want to upset them to the point they give me a bad review, you know.

Thanks