the previous owner painted the fiberglass tub and surround, it seems like with wall paint. It was not a very good job. You can see the brush strokes in the paint. Now the paint is peeling off and chipping no matter what type of cleaning product I use. It is very hard to keep it looking clean. It always looks stained and dirty. What are my options in renewing or repairing it. Or should it just be replaced. I am guessing it is about 15 years or older.