I had a fresh 42 hrs small wound on my thumb. i had no gloves when i had to wash someone else's fresh blood stain from their clothes. i had to rub a lot. i used cold water and and detergent. what are the risks of being infected with hiv, hcv, hbv?thx?

From this description, there was little if any risk, even the other person has one of those blood borne infections. Cleaning a blood stain from clothing isn't the same as direct exposure to an infected person's blood by a sharp instrument. I wouldn't worry at all about this -- especially since you apparently have no reason to believe the other person has any of these infections.