I used a squirt of dish washing liquid, 3 table spoons of bi carb, about a cup of white vinegar to 1 1/2 cups water in a spray bottle on the bathroom - we have fibre glass bath, but the tiles came up fantastic!
As for kitchen sink I sprinkle bi carb all over rub it in with scrubbing brush then a dash of vinegar leave for 1/2 hr and then rinse/scrub and they smell great and sparkle.