If you feel clean, then that will have some impact on your work. But if you feel dirty, this can show in your work. Feeling dirty can be used to an advantage for artwork, but it depends on the piece. So can feeling clean, or even feeling intoxicated.
My dad worked from home a lot, but he always took a morning shower and dressed up well. It’s all about setting a mental routine; physical work follows mentality. I try my best to live by that example.