Some years ago, I purchased a flexible hose at Lowes that fits nicely inside the inner diameter of the PVC drain line. I also installed a screen mesh over the outside end of the drain line to prevent insects and small critters from taking up residence inside the drain line.
I connected a female fitting on one end of the flexible hose. I then remove the PVC cap on the drain line and slide approximately 3 feet of hose inside the drain line. I then connect the other end of the flexible hose to the water hose. I remove the screening mesh and slowly crack open the bib valve to flush the line. I then reinstall the screening on the outside end of the drain line, remove the hose and reinstall the drain line cap. It takes about 10 minutes start to finish. Easy-peasy.
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Annie66 
NY, IL, RI, VA, RI, FL, VA, SC, London UK, HI, NY, PA, MD, NC, SC, The Villages (Professional Vagabonds)
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