Clean That Composite Kitchen Sink
I have found a cleaner that restores the brownish, stained bowls of the composite kitchen sinks. I have noticed this obvious staining on older RVs, and now mine was starting to stain too. I got a spray bottle of Clorox Clean-UP at WalMart ($2.50 I think) and used it to get rid of some mildew in the shower. I then sprayed down my plastic cutting board in the kitchen sink and after about a half hour noticed the sink was considerably less stained. So I sprayed the sink, let set for a half hour, and scrubbed with a dobie. Like new.