Wart removal help please??

I have this nasty wart on my knee and It's been treated by a doctor twice and I used to use some doctor scholl's wart remover. I'm not rich so we can't afford those surgically remove the wart method. But it came back and I've had it for a little over a year it's a little bigger now and it's PISSING ME OFF!!!!!!!!! So now I bought the doctor scholl's wart remover again and I was wondering if I could use duct tape to cover it after my first freeze???????