Autosmart Tardis is better, h'actually. Fact!
I should have known better than to post in a "detailing" type of thread without waiting for you to post first.
I haven't had time to evaluate all the worlds tar removers & test them back to back just yet sorry but what I do know is "Autoglym Intensive Tar Remover" is definitely better than petrol.
...But it may well be inferior to "Autosmart Tardis". Happy now.