Hi having prepared 6 cars for the Pebble Beach Concur
I would first ask what polish you are using.
Some thoughts would be--If you are using a true wax vs a polyurethane polish I used to soak a clean medium sized towel
in water and wring it out good and bag it, and go over the car a panel at a tme followed by a dry towel when I got there. The problem with wax is the fast detailers are a lower molecular weight and get under the wax and lift it to the surface hence streaking.
If you are using a polyurethane polish and it has cured on the car correctly, i simply use Windex followed by a clean soft towell like i'm cleaning glass. In my experiences the amonia
seems to make the Finnish harder and brighter. Now days I always use a poly based polish like Maguire's Ultimate or another great one is Finnish First
Finish First Polish
Hope this helps
Good luck at the shows