first of all, GOOD LUCK!! My girls are the same age apart, only now they are 3 and 5... same situation, the older one is my good helper, and the younger one sits back and lets her sis do all the work. sometimes, i will let the 5 year old clean up part of it, and remove her from the room and tell the 3 year old, tough love kid, YOU clean up the rest! it takes a lot of time and tears and patience (on all parts, my 5 year old hates when her sister is upset!) but it gets the job done. after about a year of sticking to my guns, when its time to clean up, they BOTH get to work and do it together. it also helps if you keep an eye on the mess and never let it build up too much. sometimes the girls get overwhelmed by the size of the mess theyve created. i'm a single mommy, i barely have time to work and clean up my own stuff let alone theirs! GOOD LUCK! stick with it, it WILL work! ~R.
forgot to mention, if the stuff doesnt get cleaned up in a timely manner, i 'threw it out' (whatever was left on the floor)... they learned quickly. granted, when they were at preschool or sleeping, i always snuck the stuff back in after a week or so, but it worked ;)