Homemade Dishwasher Detergent - One pinner says: I have hard water. I use a half borax, half washing soda mix. With vinegar as my rinse aid. I have to put 1 drop of dawn in the soap compartment (literally a teeny drop) or it wont rinse well. My dishes are nice and sparkly, and I have save a TON of money. I have been doing this about a year and have spent only 10.00.