Disposing of latex paint

In my big clean-out, we're getting rid of about 8 old cans of latex paint. I think it's acceptable to mix kitty litter into it and then put it in your trash, once it's fairly solid.

Any other suggestions? I know there is a substance I can buy to make it harden, but I'm thinking it might have undesirable stuff in it too........so maybe the kitty litter is the best?

I think I'm also supposed to leave the lids off.

Dang........a big clean-out is a whole lot more work when you actually try to do things right.......like recycling just about everything, donating the right stuff to the right places, etc., etc.

Thanks.

Disposing of latex paint