I use Gyeon Bathe, the safest are generally the companies that do coatings as well, e.g. CarPro make Reset.
Some of the off shelf stuff has other additives, e.g. Meguiars Gold Class. Not neccessarily a bad thing, but the reason they suggest to avoid waxes and the like is because it masks the ceramic coating and you don't get the full effect of it.
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