My husband fell in love with a resin sink for our bathroom, and I wish we didn't own it. It can't tolerate any abrasion, yet soap scum clings to it very badly. I wish I had a good, old-fashioned porcelain sink.

The cleaner that the mfg-er recommended doesn't remove the soap scum.
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We are re-doing the kitchen, and we have specified a double-bowl stainless steel sink that is one unit with steel drainboards that let splashed water run right back into the sink and down the drain. I think it's a nice, clean design.