If you have never invested in a pack of Magic Erasers by Mister Clean then you need to!
Buy them one time! Get that annoying mark off the wall, table, cabinet, counter top, permanent marker off something and do that once! You will be Hooked and Cleaning will never be the same and never be boring again! (well, not sure about the boring part, but it does entertain in the fact it is unbelievable what you can clean with it!
I consider it a Thrifty purchase as you will save yourself time when cleaning!