I always have a pretty strong suspicion that someone doesn’t understand how to properly clean when they say something like,
“I always sterilize my furniture.”
Someone
…because you can’t sterilize furniture.
You should know this stuff before you ever accept a client. You don’t want your ignorance about what you’re doing to set up conditions for someone to get an infection or develop a disease.
Learn about universal precautions. And then use them.