What is best way to clean porcelain sinks and bath tubs?

I have porcelain sinks with some coffee and food stains and also bath tubs with hair color. I used ajax, but it doesn't work very well. Any best way to remove these stains completely?What is best way to clean porcelain sinks and bath tubs?
you have to be careful with porcelain. dont use abrasive cleaners like comet and ajax they will scratch or damage the surface...try oxy clean. it actually does work. or hot wter and bleach. fill the sink and let it set for 10-15 mins first then scrubWhat is best way to clean porcelain sinks and bath tubs?
The stuff called scrubbing bubbles.
Try:


http://www.ehow.com/how_3137_clean-porce鈥?/a>


or


http://www.thriftyfun.com/tf184089.tip.h鈥?/a>