I do not think WD-40 would be good on the soft rubber seals..it may soften them..I am not sure...I would clean them with some dilluted APC and treat them with a dedicated rubber product....something that is good for rubber..I use Meg's 38 and it works great...or the Gold Class Trim Detailer..or
PB's Natural Look....or Lexol...just to name a few...the solvents in WD-40 may make the rubber tacky..I am not really sure...so best to go with a rubber product
AL