Put it up the top of the windshield behind the mirror like I do. For the owners of bus's imported from South Africa, its the correct, legal, position over there. Tony
I believe Auto Glym were touting a product good at removing the adhesive. http://www.autoglym.com/products/products/intensive-tar-remover But stick a retro or vintage tax disc in there. Or perhaps an ICE disc ...just in case!
I got a scene tax disk of google images blew it up a bit and put that in my tax disk holder i would take the tax disk holder out but it has all my recovery details in there.
I bought an original VW tax disc off eBay for £5 showing mar 76 which as my van was first Reg April 75 it would have carried a mar 76 disc it looks cool
I have a similar tax one, also a similar looking one that says 'tax free and air cooled'! After May I will need one saying tax and test exempt!.