How to restore porcelaine kitchen sinks?

Swinnen Lisette
by Swinnen Lisette
In the holiday homes, where I work, we have in all the kitchens, old porcelain sinks. They are very old and the porcelain is damaged. Every week I am looking at brown stained sinks to clean : clients pour their leftover coffee in the sink and of course don't rinse afterwards. The only thing I can do is bleach to get them white again. Bicarbonate and vinigar helps too but attacks even more the already damaged porcelain.One problem : we are on septic tanks. Anyone has a solution? Can I paint porcelain sinks? Will it hold up against intensif use? Which paint to use? Or should I tell my boss to just replace them (all 5) next winter? He doesn't think it is so important...because I always get them white again....Thanks !
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