What do you suggest it clean it with?Clean it really well and try this stuff. It works really well to rehydrate the rubber without making it greasy or shiny. Spray onto a rag and carefully work into the rubber without getting on your paint.
https://www.griotsgarage.com/product/vinyl+rubber+dressing.do?sortby=ourPicks&refType=&from=fn
I dampen a rag with either alcohol or non-ammonia window cleaner. It also works well for refreshing wiper blades.What do you suggest it clean it with?
I would also like to add, make sure the trim's cool...Make sure you're not in direct sunlight when you apply it.