Inform your supervisor. Determine extent of body fluid contamination of work area. Determine proper chemical cleaning supplies necessary to correct contamination hazard. Use PPE (personal protection equipment) as appropriate to situation before you being clean-up of contaminated work space/bench.
I had a very specific story in mind for this STAR question. Basically, my attitude is never give up and continue being friendly though if it looks like they will never buy then I won't throw a lot of attention their way. Just maintain good rapport in case there's ever that open door of opportunity.
If I were not able to immediately solve the CEO's email issue, I would try to explain that I was in the midst of working on an issue that has company wide implications that in turn will affect our customers if not solved very quickly and hope that the CEO would understand fixing that first is for the greater good of the company.
Only one tech question that wasn't a brain teaser- technical job related question was about line balance. There's 3 tools in a row with known stabilities. You know the second tool is very unstable but you need to meet demand.