A washing system for high temperature cleaning applications, such as carpet-cleaning, is disclosed that provides a consistent cleaning fluid temperature. The housing has a pair of first wall portions extending and spaced from each other and a pair of second wall portions defining a rectangular cavity between the first wall portions in cooperation with the first wall portions. The composition contains, by mass percent, C of 0. 3; and a process for producing a transparent coating film having an atomic ratio of nitrogen to titanium of 0.