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I’d say it’s best to only buy routing devices supporting openwrt. Some Ubiquity devices seem compatible, so maybe you are in luck. In my opinion it’s just best to stay away from preinstalled commercial software and just install Linux. You get away from the whole process of enshitification, gain long term support and an incredible set of features commercial software will never provide (at a reasonable price) imho.
I’ve been using natron (backing powder) for a couple of years now twice a week. I had no need for shampoo ever since. You just mix one tablespoon natron with water in a cup and are good to go. To even out the ph of the hair use a teespoon of cider vinegar mixed with water in a one of those spray cans used to water flowers. Works well for children as well, as none of this burns your eyes. As a side effect I stopped getting red eyes from using shampoo.