The other day, I yelled (I didn't know where he was playing) to my son naptime soon. I hear a "yate" I found him in the bathroom, cleaning the tub.
Chores only start early when my son initates them himself. He has his own cleaning supplies, in a hall drawer. A spray bottle of water, a few pairs of rubber gloves, some rags and a sponge. I got sick of him wasting my disposible rubber gloves, plus we obviously didn't want him getting into the real cleaners, so we gave him his own drawer.