how clean?


#1

How clean does the silicone groove have to be in order to get the silicone to stick?


#2

Depends what’s making it ‘dirty’. Generally speaking, the cleaner the better.


#3

Take cotton swab. Dip in alcohol. Make a couple circles in the recess. Repeat on the other one. That’s what I do. And of course, if you can actually see something in there, do it again. And if it still doesn’t stick, then you can, although I don’t, use a nail or needle to carve/scratch into the recess, to rough it up and give the silicone more surface area.