A method of washing a piece of construction equipment includes washing a portion of the piece of construction equipment with water, collecting waste materials washed from the construction equipment in a bin, allowing liquid collected in the bin to drain into a receptacle having a sloped bottom for conveying the liquid to a sump, pumping the liquid from the sump, filtering the particulate matter pumped from the pump to recover clean water, and storing the recovered clean water for recycling in a tank. Filtering includes pumping the liquid from the sump to a first settlement tank and on to a second settlement tank though a fluid path having an upwardly extending baffle providing partial wall between the first and second settlement tanks and a downwardly extending baffle spaced from the upwardly extending baffle and extending into the second settlement tank wherein liquid cascades over the upwardly extending baffle and downwardly through a space between the upwardly extending baffle and the downwardly extending baffle such that the particulate matter is left behind in the first and second settlement tanks.