Shake in a spray bottle:
2 tablespoons vinegar
1 teaspoon washing soda
2 cups hot water
Add 1/4 cup liquid soap and mix gently. Apply and wipe clean.
Countertop stain remover: Liberally sprinkle surface with salt and squeeze lemon or lime juice over the area. Let sit and rub out. This can even remove rust if allowed to sit a few hours.