DEAR MISS MANNERS: I have a cute storage rack in my guest bathroom that holds hand soap and a stack of paper towels. But more often than not, guests will use the bath towels hanging on the towel bar instead. I’ve even pulled the rack closer to the sink and put a used paper towel in the trash. Any other suggestions to let them know that these are not for show, but to use? GENTLE READER: Sadly, no. Miss Manners is embarrassed to say that getting guests to use the guest towels is the Great Unsolvable Etiquette Problem. Whatever tactic parents use to bar their children from using the guest towels,…