Yes. Baking soda is especially effective and part of many protocols for removing the urine smell. However, a single treatment may not do the trick if the urine has already...
No. Do use a pen or any other writing utensil. If you want to go this route, I suppose you could use a VERY well-cleaned screwdriver, large nail, awl, etc.,...
Put on safety glasses or swimming goggles if you're really concerned. Or, try not to squeeze the juice into your eyes by keeping the lime angled downward at all times...