Biohazard At Work?

I deliver / pickup tires for retreading and scrapping. Thursday I loaded my box truck full of tires and got splashed (a good amount) in the face with a liquid while stacking them. Low and behold it was urine (obvious from the smell) that was 'diluted' with water from the house at the business. When I got back to the shop, I notified my supervisor and told him that I'm leaving to go shower.

Friday morning I had to document the almost 100 tires, getting splashed again. This time it was halfway down both shins into my boots. After I was done documenting, again, I went to my supervisor stating I was going home to shower. I didn't return to work due to frustration/disgust/searching for my options. My supervisor called me while at home and asked if I was returning. I went off on him a little expressing my concerns. He replied with "it's part of the job." It's not.

I had to approach my GM about the situation this morning (Monday) asking what his plans were for the customer this happened with. He said he would get with the salesman etc etc.

Should I wait to see what my boss says? Contact OSHA? File a police report? It'd be a different story if I got sick from it, but I just want to know my options if any.