Is there any way to remove deteriorated roof gutter sealant non destructively in order to remove rust and reseal against water leakage Ford Van?

Yes, you can remove deteriorated roof gutter sealant non-destructively by using a heat gun or a hairdryer to soften the sealant, making it easier to peel off. Alternatively, a plastic scraper can help gently lift the sealant without damaging the underlying surface. After removing the old sealant, clean the area thoroughly to eliminate rust and debris before applying a new sealant designed for automotive use to ensure a watertight seal. Always follow up with rust treatment if any corrosion is present.