I use a pump pressure sprayer through the drain hole. Vinegar...Tractor Supply, Rural King, just about any place that has a good supply of canning jars for sale....even Wally Word.
Experience is what you get when you don't get what you want.
2017 White Hawk 30RDS (It's the wife's. I'm just the driver)
15 years on a Harley with a tent and then life happened.