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I use 100% pure silicone spray to melt off adhesive, and lettering, I then use a rag soaked w/mineral spirits to clean the area, then dry well.
To apply decals "Straight", use a little bit of "Dawn" dishwashing detergent and water in a spray bottle, wet the area to be applied well with the soapy solution, wet your hands, fingers and anything else that might stick, peel off decal back and apply decals...*%$# NOT straight ? No problem, just slide them until they are straight, let dry over night, Ya done !

Wax: I use collinite, some don't like it (tough to work) but, it really shines. Any good automotive wax will work as well.