A glass of cold water usually leaves a white ring on your wooden furniture. What to do? Reach for a pat of butter and apply the spread to the mark. Rub it in with a soft cloth and let sit overnight. The next day, wash away the excess grease with soapy water. The oils in the butter will seep into the wood’s pores, displacing the trapped moisture that’s causing the ring. Plus, the milk fats will reseal the wood’s grain, so it will look as good as new.