Thank you for the replies.

Well, it's clear that the shower it's a point. What i found strange is that the same adhesive that i use on the sides have a better resistance to the cleaning agents than the same adhesive but used at the front. May be it's matter to be more gentle with that area.
Also i remember a tip from MichiganBaldy about seal the front with got2beglued, during gym sessions.
I'll be trying all those tips to give to my frontal a life on 5 days without touch up's. as a goal.