This recipe is easy to do and is more economical than ready-made products.
2 cups rubbing alcohol
½ cup ammonia
1 teaspoon dishwashing soap
Mix all ingredients together, adding just enough water to reach the 1-gallon mark, and divide up into spray bottles for all bathrooms.
Can also be used to clean exterior windows.
If doing a big job like that, make sure the water is hot.
That will help dissolve the dirt.