I can give you the tools, but you have to do the work yourself.
A play on the words "tools" and "work". Therapists often ask for emotional buy-in from their clients: there's no passive cure that they can impart, so while they can provide the emotional tools for healing, the patient has to meet them in the middle by doing the emotional work with the tools. But here, the tools and work are literal, not emotional: the literal tools are soap and a brush, and the work is literally scrubbing, which ties together why the patient is in a bath tub.