I tried it when i first got simba as he had a taste for cables, curtains, carpets and skirting boards!! You have to keep applying it and it does make your room smell of citronella!! Im not sure if it did the trick or whether he just grew up or got the idea as i always clapped my hands and shouted OI at him when he went for a nibble.. always made him jump and stop. Luckily he doesnt nibble anything anymore. Someone on here once told me that Dove soap, i think it was that, works a treat as well!