ANSWER: Dye or food stain is not impure hence has no affect.  If there is impurity like mathi, urine etc then you must wash the affected areas or change the ihram and wear another ihram.

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ANSWER: As long as you don’t take any of their time, this is fine but you can pray thuhur on time in the office and if your lunch break coincides with Asr, you can go to the masjid

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