1993 Buick Regal Owner's Manual - Page 208

Remove all the wheel nuts and take off the flat tire. A CAUTION: iP Rust or dirt onthe wheel, or on rne parts to which it isfastened, can makethe wheel nuts become loose after a time. The wheelcould come off and cause an accident. When you change a wheel, remove anyrust or dirt fromthe places where the wheel attachesto the vehicle. In an emergency, you can use a cloth ora paper towel to do this; but be sure to use a scraper or wire brush later, if you need to, to get all the rust or dirt off. Remove any rust or dirt from thewheel bolts, mounting surfaces or spare wheel. Place the spare onthe wheel mounting surface. 206