In most cases, yes. The film is caused by mineral deposits left behind when water evaporates. These deposits can build up over time, especially with hard water. Soap scum and mineral deposits accumulate quickly, so it may be necessary to scrub the tiles every week to keep it looking its best. Although, if you use a quality cleaner and sealer, you should be able to extend the time between cleanings. You can also try using a vinegar solution to clean your tub or shower regularly.