found a new use for citrus acid..... I put some in my aluminum bright (which is a great concrete cleaner and citrus acid can be used as a degreaser ) I added about 1/2 pound to a 1/2 gallon of acid with 4 1/2 water in a 5er and down streamed it... I was cleaning a garage floor that hasn't been cleaned in years for Ryder truck rentals.... I used my surface cleaner with hot water

.. The citrus acid mad a difference