I found rewards like stickers don't work for my DS. He will only do things for TV time and even then he whinges lol! He will put his uneaten food in the bin & plate in the sink. We praise him & he loves the attention and being able to do "big boy" things. He will only help clean up if we make it fun. Even DD will "help". She loves to put the blocks away. Then take them out again DS will do races (let's see how quick we can put the books away!) Throwing games (can you get your matchbox car in the box?). Bribing him with TV sometimes works (if you do X, you can watch TV) but sometimes he just won't and will go into meltdown if we push it. He is 3.