first of all, Conrgatulation! you have gave your baby the best milk for the past 1 year.
when baby grows, it is normal that their needs for breastmilk reduce, since they eat more solid food now. with that, our supply reduce too ~
washing of pump parts really tiring. i can understand that..which i decided to keep my pump in store room when my son turn 16 months.
i only managed to get about 20-30ml by the time i gave up pumping.
now we only latch when i return from work and nurse to sleep. Weekends, nurse as and when he ask for it. i no longer worry about my supply since it is no longer his main source of food. (maybe they treat breastmilk as snack. ?! hehe)
So, just go with the flow and no need to stress over it. your supply will still be there as long as you still latch your girl ~