Video tutorial on how to remove sap from paint. The same methods can be applied to your vehicle’s glass as well. Unfortunately sap can be hard to remove and should be addressed immediately when found on your vehicle. If left on for extended periods of time, it can become quite hard and eventually stain the paint. When you’re removing the sap, always ensure the area you’re working in or preferably the whole vehicle is washed thoroughly to remove any contamination which may cause scratching.