303 Aerospace rubber seal protectant helps a lot with this.
Use this on the seals after you clean them...
https://www.amazon.com/303-Rubber-Protectant-Conditioner-Weather/dp/B00T44D1R2/
I use 303 rubber seal protection from Amazon https://www.amazon.com/303-Rubber-Protectant-Conditioner-Weather/dp/B00T44D1R2