The flag may be laundered or drycleaned appropriately for the fabric. Some drycleaners will do so for free. The flag may be trimmed slightly to get rid of tatters and may be sewn or stitched as necessary as long as the proper ratio in not altered.
National Flag Foundation National Flag Foundation
Respect and honor the flag as you should the country that it represents. You don't have to. That's the most wonderfull part. But you should.
Don Scribner USAF Ret.