Here we present results highlighting the differences that soiling and cleaning have on concentrated photovoltaic arrays (CPV) specifically focusing on ultra high concentration, >1000 Suns, photovoltaic (UHCPV) arrays in a desert environment. Soiling losses in UHCPV arrays differ from those of conventional photovoltaic (PV) arrays, to illustrate this difference we present a direct comparison between a UHCPV array and a conventional PV array showing that soiling has an approximately five times larger effect on the UHCPV array compared to a PV array.