For safety reasons, discard 100% of the alcohol from this initial run, as it will likely contain gray or black industrial contaminants.
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By vevor
Soap and vinegar clean surface grime, but only a sacrificial alcohol run dissolves deep-seated manufacturing oils and flux.
Alcohol acts as a unique solvent that pulls out chemical residues that water and vinegar simply cannot reach.
Since your 13.2-gallon still has a thumper, the alcohol steam is vital for sanitizing that extra internal surface area.
Skipping this step often results in a permanent metallic or chemical "off" taste in your first few consumable batches.
By vevor