You can use a 3% hydrogen peroxide solution; it's safer than ammonia and just as effective.
Please note that when I say "effective" it doesn't mean there is a 100% guarantee that this will eliminate crypto. There's no substance that you can be absolutely certain will do that - so I am glad to hear you are not re-using enclosures or furnishings.
I'm sorry you lost your geckos; crypto is a nightmare.
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