After driving on dirt roads in Death Valley the Subaru was filthy and in desperate need of a wash. $ 2 in quarters earns a few minutes at this self service facility — started with the soapy high pressure sprayer but then when it came time to use the brush there was little if any soap coming out. Fortunately I was able to get most of the dirt and bugs off the windows with just the sprayer but without a soapy brush there is really no way to do a through cleaning