Top mount worry.

Should I be worried? Just been cleaning the scuttle panel and came across this when I took the cover off.

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Nah mine was like that just the rust coming off. Give it a good lashing of WD40 once clean as well as the wiper arm pivot points!

I did inquire about some new covers as like yours mine had the rubber bits hanging off, £14.38 each + a bit of postage for some new ones.
 
I was thinking about waiting until its dry and super gluing the rubber back haha. It only worried me because the passanger side one wasnt rusted in the slightest..