Mine love to chew everything in site! Mine chewed up the blind in the window so I went this weekend and bought new ones to replace the chewed up ones...The new ones didn't last a day

I was so mad at my babies but I never know which one does it. I think its my girl though..she loves to chew on everything. I'm still pretty upset about it..I even sprayed it down with bitter apple but they chewed the corners and I don't think I sprayed that section. So what are we to do?!?! I hate being mean to my babies.. the minute they look at me like MOMMY WHAT DID I DO...I instantly melt..I know its bad but I do. Plus I have no support with Daddy...he melts too!