Ghusal

Iron dust getting stuck on one's body

Q: Does a few miniscule grains of iron dust (grains are less that 0,5mm) affect the validity of the ghusl or wudhu? Such grains are mostly on ironware like housekeys or after doing some ironwork a few stay on the hands even after washing. You can notice them best if you hold your hands against the sunshine then you see them blinking. Few days after ghusl I notiticed few such miniscule iron grains, you can hardly notice them unless light falls on them so that they blink. The grains are less than 0,5 mm. Seems to me that they are kind of unavoidable especially when walking barefeet on floors etc.

Doubts on ghusal

Q: I have a question regarding ghusl. I get constant doubts about the validity of my ghusl. If someone performs ghusl and then sleeps and then does salaah at night but at night time they get a doubt that if the eye and eyebrow was properly washed in ghusl or if it was accidently left dry (note this is more based on doubt rather than certainty). The person then goes to the bathroom and washes his eye and eyebrow with the niyyah of completing the ghusl. Is this valid and he does not need have to repeat his ghusl?  If one hesitates to wash it due to waswasah or because he isn't sure, does he become napak again?