That's it. I'd def use regular tap water for the cleanup or you'll wear out a set of ro/di filters/resin on a tank that big just to clean it. Maybe the last rinse and final check use good water. I'd also do the baking soda on the last rinse too. It's probably unnecessary but it would be a good piece of mind that it would neutralize any tiny bit of acid that remained. Start with a low amount of acid and start to clean, if you work too hard, bump up the concentration. Wear some good chemical gloves too. I've reached into my 3:1 bucket and grabbed something that drops and then did a quick rinse but really that's dumb. I'm not too sensitive to it but some people are so don't risk it. To save money you could try to mix it and work an area at a time with a stronger concentration vs. the whole tank by just having a rag that you wet down and rub on it kind of like hand mopping a floor and then have the hose in there to squirt it down. Maybe even rig a hose the bulkhead somehow so that it's on a constant drain as you clean. Although that way doesn't allow for a good soaking which is where the cleaning gets easy. It should almost wipe off with a rag doing the whole tank/soaking method and you may not have hardly any real scraping to do. The whole tank soaking method would also help with any that has gotten into crevices, existing scratches etc.
