How to purge unmatched receipt remittance reference details

Summary: We have been using "Create Remittance in Spreadsheet" to create remittance reference lines (match by Trx#, Trx#, amt to match) and then run "Apply Receipts using Automatch". After many months, we realized we have few thousands of unmatched remittance reference line per business unit resided in the system. Is there a way to purge unwanted unmatched remittance reference lines?

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