Window and door rubbers

1Z Gummi or the slightly better (but far more expensive) Wurth version, applied *very* infrequently as it just doesn't need done very often IME.  But for the exterior rubber seals I usually just 1) clean with Griot's Rubber Prep, 2) seal with Ultima's TTGP, and 3) maintain with ValuGard's Fast Finish.
 
The pros would know better, but on a whim I picked up the Turtle Wax trim restorer when it was on sale and I've been very pleased with it.  Easy to apply, and it stands up to the elements admirably.
 
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