Cat Allergies Treatment

My cat has pretty bad allergies, and he has sneezing fits where mucus and blood are sprayed everywhere. He’s seen the vet and everything (we’re waiting for the medication to take effect), just as an FYI. How do I clean cat snot and blood off my walls?

Does anybody have any recommendations on the best way to clean carpets that have been affected by cats? My fiancee is allergic to cats and we are buying a home from a cat owner. We want to have the place professionally cleaned but don’t know the best cleaning service to get for this matter. Any recommendations?