I find a brillo pad works well - if the spot is sticky just give it a good scrub.

JUST KIDDING!!!

Sensors are very delicate. A rocket blower brush is all that is needed 99% of the time, especially if your camera has a sensor cleaner (as most do these days).

Very, very occasionally (I think three times in two years of heavy use), I have used the pec pads - they worked fine. The ones I used were "one time only" and came packed individually in sterile packs. I would have no hesitation in using them again, but I emphasise that I used them very occasionally.

Mike