We all have that habit of storing harmful chemical underneath the kitchen sink. I think we do it because it's how we grew up and it's the space that doesn't quite have full storage capabilities. This is the one area in the kitchen missed during spring cleaning. Remember to go through all of the old bottles and chemicals to see if the product is still good. Also ensure of correct disposal of those items. Harmful chemicals shouldn't be poured down the drain or dumped in the garbage. Check with your local waste management on proper disposal.
Once you've cleared out the cabinet, invest in an expensive storage container, similiar to the one linked. It's a great way to store your product and easy to pull out when you need something. Happy Cleaning.