Neighbor is out of town for a week so I'm doing some work around her house. Want to clean her hot tub since I use it a lot. Figured starting with a gallon or so of bleach, letting it run overnight then draining it. Wipe it down, fill it again then another drain to flush out whatever is left and change the filters. She's very "nature" conscious and isn't big on chemicals unless they're "natural". She approved of the bleach so somehow it's okay. I have absolutely zero experience with hot tubs, so am just guessing on what to do. Any advice would be appreciated. If I do use chemicals of some sort, I figure I could flush them out with the second drain and she'd never have to know. It's actually very clean, but skin cells, hair, body oils, etc. build up and it needs a drain/refill every few weeks.