One easy way of saving money is to use less of the suggested amount of cleaning products. Shampoos used to always say lather, rinse, repeat. Many of them probably still do. However, unless you have a lot of buildup, it is rarely necessary to lather more than once. In addition, you can use less shampoo for that one lather. Have you noticed too, that some shampoo bottles are less tipsy if you set them upside down? That way the shampoo will come out faster, and you will use more.
Laundry detergent is also overused. If after you put your clothes through the rinse cycle, you notice a lot of suds in the laundry tub, you are probably using too much. Try using a little less each time to find the optimum amount for cleaning your clothes. Soap buildup on your clothes is not that good for them either.
Dishwasher detergent can be adjusted the same way. Start out by reading the directions in the manual for your particular brand. Most people fill up both soap containers without thinking about it. As with laundry detergent, you can experiment to see how much you really need.
There are more ideas about saving money by using less here: http://www.savingadvice.com/articles/2010/05/24/106112_save-money-by-using-less-10-products-you-use-too-much-of.html