How can I potty train my 5-year-old non-verbal autistic son?

My son is 5 years old and still pretty much completely non-verbal. He will show me what he wants in other ways such as leading me somewhere to show me or bringing me his empty cup to re-fill.
Trying to potty train him though has proven to be extremely difficult. Any parents with autistic kids have any advice? Would be much appreciated.
How can I potty train my 5-year-old non-verbal autistic son?
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