The only risks for HIV in adults are:
1) Having unprotected anal or vaginal sex, or
2) sharing intravenous needles with IV drug users.
Touching blood or other fluids on surfaces or fabrics is NOT a risk for HIV. You will never get HIV in a bathroom unless you have unprotected intercourse with someone, or share intravenous needles with someone, in the bathroom.
Air inactivates HIV to add to Curfew's list of risks, so this would not be a way that anyone would ever get HIV.