You can use ONR with cold, warm or hot water. Downside of hot water is the ONR could dry quicker on the panel. This is not a problem as more ONR will remove any dried ONR. I just tend to use warm water.
ONR is also safe in a steamer.
ONR can be added to a traditional shampoo if you wish. It will add some more lubrication and soften the water a bit. The downside is the ONR will dissolve all the bubbles.
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