Passing Total to Confirmation Page via query string Without Currency Symbol

Hello,
I'm using GF to sell a configurable service (a product with options).

I would like to pass to confirmation page (redirect page) via quesry string all info I need to build Google Analytics ecommerce Tracking code.

The only issue I'm having is about the Total Amount: I can't find a way to pass it without the currency symbol.

I've tried like this:
total={Total:87}

and like this:
total={Total:87:value}

but in both ways the querystring is dirty (as the currency symbol is converted to be URL-compatible) so I keep get something like this:

http://www.mysite.com/thank-you/?total=136%2C90+%26%238364%3B

is there a way to clean the value of that field to have just the numeric total?

If this is the only way I have no choice.
I'll try and I'll let you know