I have been a Finishkare guy for years now. The best after wash spray I have ever used is FK 425. The stuff is magical and affordable. I use their ph balancing car wash soap. Also their other waxes and decontaminant treatments are excellent as well.
Here is the link
http://www.fk1usa.com/products-consumer.htm
You should try the 18.00 kit first.. this is a sample of their products. I love them!!
Best of luck!
by the way, I havent seen Perfectlap comment yet??? vacation??? ; )