Clearing cart when only "Free" items left in cart?

I would like to automatically clear the cart if everything in the cart is free. How can this be done? does the hikashop have a clear function?

You can use such php code to clear the cart:
$class = hikashop_get('class.cart');
if($class->hasCart()){
$class->delete($class->cart->cart_id);
}

this code as is is activated when the cart only has Free items in it? as in i deleted everything else and only items that are free are left. they are not being displayed in the cart but the cart still comes up with the final total of 0.0. we are hiding the items but they are still in the cart.

No. It cleans the cart all the time.
You need to loop on the products in the cart to see whether the products are free or not before using it.

how would i loop them through the items in the cart? got example where all i would to do is call the function to be called?

It's really not complicated... Here is an example:

$free = true;
foreach($this->rows as $i => $row){
if(!empty($row->prices)) $free = false;
}

if($free){
//do something
}