To think in for a penny, in for a pound means that if you have committed to doing something, you should do it completely without sparing any effort.
Context: oh hell, I thought if you're going to do something, you might as well do it right and go all out and scrubbed the place from top to bottom.
Hypothesis: Oh hell, I thought, in for a penny, in for a pound, and scrubbed the place from top to bottom

Given this context, is the hypothesis true (Yes/No/I don't know)?