Hello,
Thank you for your query at doctorspring.com
Under no circumstances must a cotton be re-used in the setting you have described. The possibility of getting HIV this way has never been documented and appears highly unlikely.
But no alcohol does not kill the HIV virus. Glutaraldehyde is probably the most effective disinfectant to inactivate HIV virus but is not used routinely because it causes hypersensitivty reactions in persons repeatedly exposed to it.
Hope this helps