A vintage label tells the owner how to clean a material. That instruction is useful historical evidence, but it is not automatically suitable for an aged object in its present condition.
Record the advice in context
Transcribe the relevant wording, product identity and source date when known. Note whether the instruction belongs to this exact item or a broader product range. It may reveal what the manufacturer expected users to do and what qualities it advertised.
Separate reading from treatment
Do not apply an old chemical, heating or washing instruction simply to test the claim on an irreplaceable item. Material changes, repairs and uncertain identification can matter. Preservation decisions should follow appropriate contemporary expertise for the actual object.
A collection note can therefore contain two clearly labelled sections: historical instruction and current condition or care information. Keep quotations brief and identify the source. This allows the label to tell its story without turning research curiosity into an uncontrolled experiment on the object that made the research possible.