What clay are you using as am part way through a Audi at the minute and that was the same, tried mild clay and it didn't lift a thing so used Megs Aggressive Clay and now its like glass.

With the aggressive you will need to polish after as the clay will leave its own marring marks on the clearcoat

This is after a small patch of the bonnet



Took 4hrs do do the whole car with 2 of us on it, worse one i have done yet with regards to claying