Cleaning camera on skyprodigy telescope

[Hythlodaeus]

Hi folks, noticed there's a smudge (not finger print) inside the starsense camera lense on my skyprodigy 130, bought this scope second hand last year its been there since i got it.

Just wondering what would be the best way to clean this smudge off, I wouldnt say its affecting the star sense set-up much, but there is a slight miss allignment when going through set-up and locating a few objects. Also it seems to be affecting how many objects the camera picks up during set-up.

Had a look on flo, there's a celestron lenses pen would this do the job, never had to clean any lenses/eyepieces before, not sure if the camera one is as delicate as an eyepiece?

Was thinking  cotton bud and fairy up liquid? no?

[Steve Ward]

Baader Wonder Fluid and a Microfibre cloth from FLO .... http://www.firstlightoptics.com/astronomy-optics-cleaning-protection/baader-optical-wonder-fluid.html