I have a Laserwash 360+.My first presoak goes on great. Presoak 2 goes on ok but it spits and sputters some. When the wax goes on it spites and sputters really bad and starts striping. I have changed all the injectors and played with the air pressure with no success. I assume its the different thickness of the chemical but it worked fine when it was installed 6 years ago. Any ideas?