whiteboard cleaning: You can use Air Freshener to clean a dry erase board that just won't erase (because the ink is very dried on) . Spray the board and wipe, it also helps "recondition" old dry erase boards.
100 Things You Can Purchase from the Dollar Tree and Use in the classroom with over 150 activities using those materials! So many great ideas in this post! You don't know how many things I use in my classroom from Dollar Tree. This is my favorite store.