I'm really sorry to hear about your stipe problems!!!
I have white stripes and they look great - in my opinion...
Do you cover your car? do you wipe it down after it rains? We have very hard water here and if it rains and your car is uncovered - you're getting big spots... on everything...
I am thinking you might need a good detail and seal... then keep them as dry as possible...
I don't let rain or bird poop bake onto the car/stripes... and I use instant detailer quite often... along with a very good detailing routine, which includes a couple layers of wax... and a sealant twice a year
I am just not sure why you're having such a problem

Let's see what others have to say!!!
