I second Mrs. Meyers and vinegar. I also use baking soda and Bon Ami but I don't know if they actually disinfect. I would think vinegar is your best bet for that. I am still hooked on chlorine bleach for brightening up my sink once a week. It's all I'm still using it for and I have got to find a replacement - I'm hooked!
ETA- I meant my kitchen sink- it's white Corian.
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226