Wanna know what you can use to clean grout lines, corners, nooks and crannies, etc? Use an old electric toothbrush or buy a cheapie at such places such as Dollar General. You can usually buy one there for around $5.00 or just a little bit more. This also works well if you have a stubborn stain in laundry. Put your stain remover where it needs to be, turn on your toothbrush and scrub away!
To help the cleaning power of the brush, make up a paste of baking soda and water. Apply the paste to the surface that you want to clean. Now, turn on your handy dandy toothbrush and go to work! For extra brightening and freshening, allow the paste to sit in place for a little while before you brush it. When finished, rinse off the surface well.