Daniel Prince wrote in
:

I have a cooktop mounted into a ceramic tile countertop. I have
caulked it several times but after several months the caulk comes
loose. I clean the surfaces with detergent and then with rubbing
alcohol. I use silicone caulk.

Is there a better way for me clean the surfaces? Is there a caulk
that would be better for this use? Thank you in advance for all
replies.

Does it get very warm where the caulk is? If so, MAY BE the cause. Find a
high heat caulk. Google "high heat caulk" should get you some leads.