I wanted to give Donlon Plumbing in Ventura County a big thank you for the simple plumbing tip.  We received a call for low water pressure in a Ventura home rental we manage.  Pete Donlon, the plumber, suggested we take off the high end shower head and soak it in CLR in a bag for a few days.  We followed his lead and sure enough the shower head was as good as new–the hard water build up cleared right out.  Thank you Donlon Plumbing in Oxnard.