1. Rubbing alcohol only.
Using alcohol always good.
2. Preferably directly on the skin
The light needs to shine on the skin...
If melatonin in the skin blocks the light penetration significantly, as John said in the SAMA, then clothing will block it.
For more details, please check the link:
https://www.facebook.com/groups/spooky2/posts/2299444823550741/
https://www.facebook.com/groups/spooky2/permalink/753666838128555
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