You should get older (years past) kids shows on DVD and/or download them from
the Internet. I'm against censoring content and am not suggesting you limit
what they watch. Downloading and watching DVDs of kids shows just reduces the
amount of garbage (advertising in general) and gives you an opportunity to
explain why you dislike a particular show or how advertisers 'lie'.
There is one kids show I've seen in particular I dislike. I think it is
called 'hackers'. It is a cartoon with a villain called hacker. It is just
wrong. Everything in it suggests hackers are bad people and break into things
(or something along these lines). It is a good example of a show presenting
bad information.
I think children should generally be encouraged to question authority and
information taught to them. There is a lot of bad information out there and
it isn't all coming from the web.