Been down this avenue before!
The best thing to use for rubber seals is Silicone Spray
.
Superb stuff that costs about £4.50 per can and does not dry out, like WD40 for example.
Halfords do there own brand as well as the one above.
Just spray this onto a cloth and place it upon the rubber seals. Last for ages.
Used this stuff as well to keep the windows moving up and down smoothly.