Bosch pressure washer

hello sir,that is ongoing problem with power washers the pump not working. than working sporadically. the main cause is leaving the pressure hose hooked up to machine over a long period not draining hose & machine,in winter time the hose & pump will freeze causing hose & pump to expand and burst.build up of calcium deposits from hard water clogging up pump nozzle,valves in the gun handle,clogging hose fittings and screens.one of these has to be the problem.hope this helps,good luck,MrFixIt. oh could you please give me a rateing.thank you.