Oil’s the easiest finish to refurbish, although the end product tends to exhibit a certain stickiness that attracts dust, even when dry. Go with a product your manufacturer recommends if possible, but otherwise you’ll find excellent, relatively inexpensive, linseed- or tung-based oils from Watco (www.rustoleum.com), Scott (www.scottsliquidgold.com), Minwax (www.minwax.com), and others at hardware stores. Most experts advise applying the stuff with a polyfoam brush and then thoroughly rubbing it in with clean terry-cloth pads. Do one coat and let it dry for a few days and then apply one or two more, depending on the appearance you’re shooting for. And bear in mind—in order to effectively switch to oil on woodwork that’s already varnished you’ll need to remove all the varnish first, a wicked job. here