We use the proper precautions and procedures for any engine bay treatment. Majority of vehicles are well covered but some older models need more awareness to protect electrical components. Custom aftermarket air intake systems will be removed or covered to avoid potential damage. Older engines need more  awareness and different methods to achieve a safe result. Sometimes best to use a vapor steamer with detail spray instead of using a power washer to safely clean without damaging components. After the cleaning/decontamination procedure we apply Feynlab Ceramic Plastic to hoses and plastic pieces to reduce future oxidation and promote color depth.