Good morning,

Yes, clear glass vials can be sterilised after use and this procedure can be repeated several times. 

Some recommendations for the sterilisation process:

1. Pre-cleaning: Make sure that the vials are thoroughly cleaned before sterilisation to avoid residual contamination.
2. Inspection: Check the jars for damage, such as cracks or chips, which could compromise their integrity during sterilisation.
3. Sterilisation method: You can use autoclave, dry heat oven, or any other sterilisation method suitable for glass.
4. Proper handling: Use sterile gloves and sterile forceps to handle the bottles before and after sterilisation to avoid recontamination.

As for the exact procedure, it will depend on your facilities and available equipment. We do not intervene or offer specific guidelines in this regard.