when I got some Sonus polish on mine I used Windex. Make sure you put some 303 on the stripping. A tip I learned and do every year to prevent weather stripping from cracking or rotting. Especially around the inside of the door. Is talcum powder.
1Z Gummifledge on weatherstripping is incredible. My search is over for a fantastic weatherstripping protectant. I'd highly recommend it to anyone. Better hurry though if you want any. (The Autopia Store sells it...for a little while longer).