preventing sink scum

[Lacustral]

I used to live in a place with a porcelain sink, it almost never had to be cleaned.

but in the places I've lived since, with plastic sinks, the scum builds up really fast.

Why? my guesses:

Maybe it's a difference in the water? hard water causes more scum?

possibly, porcelain is smoother microscopically, and the soap/oil sheds off it?

possibly, difference in how fast the sinks drain?

anybody have experience with porcelain sinks, are they better this way?

Laura

[Phisherman]

Porcelain is much easier to keep clean and harbors less bacteria--it stays smoother and dries faster. Gritty cleansers will scratch plastic composite and porcelain bathroom fixtures, and these scratches create places where dirt and bacteria live.