Hey I heard that deal about using alcohol mix to remove the old wax etc too. I used to have an acura with graphics on it, and i used it to remove the residue left behind when i stripped them off and the old wax to. However for what you really want to gain, alcohol isn't really effective. It will remove the wax, but it won't remove contaminates that have settled or found their way into the paint pores.
Here is a tip.....
Wash your car, then take a piece of the clear wrapper on a pack of cigarettes. put it between your fingers and the paint surface. Most likely you will feel a really rough surface. Take the wrapper away and run your fingers over it, it will feel smooth. Our sense of touch isn't significant enough to pick it up without using something like the wrapper to amplify the imperfections.
Those rough feeling particles are contaminates that have breached your wax and/or sealant. Alcohol will not remove them, even after removing wax.
Here is what I have found to be the quickest and easiest way to get top notch results................ Wash the car with a strong soap like dawn dish soap. (this soap actually removes wax). Then take a clay bar (any old clay bar, because they all get them from the same place only 1 company in world actually makes them) cheap is fine. When wet, clay rub the entire car. You don't need clay lube, water is fine.. Rubbing the entire car vigorously should take about 20-30 minutes. By now, no wax is left on the car.
Then use a good Pre-Cleaner Wax to remove any minor scratches, residual oxidization or residues left behind. I recommend Amino-UV's Restoration Pre-Cleaner (fairly new product). After you use RPC, the paint will look extremely consistant and fresh, but not glossy. That makes a good foundation for a sealant. Then apply your sealant or polish.
You will have better results that way. Using the pre-cleaner just makes the sealant have a "better" bond and makes it last longer.
NOW, run your fingers over the car with the wrapper, guaranteed, your car has never felt so slick or been as shiny. Recently i tried the Amino UV Polymer Sealant on my Audi and the Poorboys on my wifes Honda. Though Poorboys worked well. I think the Amino UV works the best! Good Luck.