It's a difficult question. Actually I was always of the opinion that cleaning up after work was part of the work and so I tought it to the kids (still I have to do a lot of the cleanup). Maybe I should reconsider.

On the other hand I think it is important to not correct them too much and let them make errors and even ruin tools. Also a little bit of guidance can actually speed up learning (if they are even willing to take some advice).