Acrylic and fiberglass should provide many years of solid service. However as with anything a little care is required to maintain the beauty and appearance.
WAX ENTIRE UNIT at least once per year. Any carnuba based wax will do a good job. If using a paste wax, allow wax to dry i.e. a haze develops, then remove with a soft cotton rag. This gives the best and longest lasting results.
DO NOT USE ABRASIVE CLEANERS like Ajax or Comet; these will scratch the surface. Use liquid cleaners only. There are a variety of cleaners available at your local supermarket.
DO NOT USE SOLVENTS such as lacquer thinner; these are very flammable and will harm the finish.
In extreme hard water conditions, mineral deposits may build up over time. These can be fairly easily removed with Arm & Hammer Baking Soda. Make a paste with water and scrub affected areas. Wax after scrubbing.