Lazy Daze Owners' Group

Sandy

In over twenty years of LD ownership, I have never demineralized a tank with vinegar,  instead  use a water heater flushing tool.
Amazon.com: Camco 11691 Water Heater Tank Rinser: Automotive Water Heater Flushing Tool - Parts & Accessories - RV Water Heaters - RV Appliances

Remove the plastic plug on the water heater, the one used to drain the heater.
Attach the flushing tool to a garden hose. Turn the valve, on the flushing tool, to the 'off' position.
Insert the tool inside the drain hole and then turn the water on. 
Energetically, push the tool in and out, while rotating the tool. You are working to break up and flush the mineral build up that every water heater develops. 
With the plastic tube, there is no danger of damaging the heater, while physically scraping the scale loose.
Don't be shy, work it. The tube will get scraped up but that isn't a problem. It's cheap tool.

Every 30 seconds or so, pull the tube out and let the water drain out. In most cases, the ground will look as if it has just hailed, with thousands of small chunks of calcium littering the ground.
Continue with this process until the water drains clean.
This is a good thing for all LD owners to do annually, more often if you full time or use it in an area with hard water. The washed out mineral is very soft and can be swept or vacuumed up.

When done replace the plastic plug. The plugs are easy to cross thread, so it is suggested to have a spare on hand.
Do not use any metal plugs, plastic only.

Larry

what is the problem with a metal drain plug?    Mine had a metal drain plug when I bought it. Actually it's like a plug inside a plug but I had to remove the larger one to get the tool in to flush the water heater.