Froggie, I think the necessary part of the plan working is to inform your spouse of A) what you are doing; and B) what your expectations are of them from now on.
For instance, I would have said, "I am no longer wanting to do the brunt of the housework so from now on I will do the showers and the trash. I want you to be responsible for the rest and my thinking is that regular cleaning should be done twice per week. What do you think of this plan?"
Then take into consideration what her thoughts are and hammer out a plan that works for both of you. If/when she flubs up (which she will) then you can say, Hey I thought we had an agreement for cleaning the house twice per week. What happened?
I have no doubt that she noticed that you had stopped doing the cleaning but rather than think she should take up the slack, I would wager that she was thinking, "Hmm, I wonder when he's going to clean the house..it's really getting messy."
