Ok, Waffles is driving me insane

We have really large windows in the kitchen and on one side she can reach the gooey sealant stuff (don't know what it is called but it is white and rubbery??)

Anyway, she is obsessed with picking it off. If I go into the kitchen she jumps off of the side and runs onto the table and does her I-am-doing-something-naughty meow.

This morning I got up and was greeted by Waffles carrying a large bit around in her mouth so I took it off of her and said NO! and two seconds later she was up there again

It was 6am so I wasn't impressed. Well, I am going on - I was just wondering - what is that spray on stuff that repels cat? Apple something? And can I get it at P@H? Or any other tips for stopping her - I swear she will take the window down one day