Why is Justin Turner's jersey stained

The Red Sox today signed INF Justin Turner to a one-year contract for the 2023 season, with a player option for 2024. : r/Dodgers

Does JT Ruin Every Jersey of Every Game or What is their Laundry Department Using to Clean Them? I Need Some of That Detergent! : r/Dodgers

Why does Justin Turner always have a black smear on the back of his jersey? Superstition? Also, why do some players batting helmets have mud/oil rubbed on the front of them?

NEW Justin Turner Dodgers Replica Tar Stain Giveaway Jersey

Justin Turner of the Los Angeles Dodgers rubs pine tar on his back Photo d'actualité - Getty Images

Dodgers Star Justin Turner Has Unusual Jersey Modification

Plaschke: Justin Turner's act of selfishness leaves stain on Dodgers' championship moment - Los Angeles Times

Dodgers Star Justin Turner Has Unusual Jersey Modification

Why does Justin Turner always have a black smear on the back of his jersey? Superstition? Also, why do some players batting helmets have mud/oil rubbed on the front of them?

How Justin Turner gets the pine tar stain on his shirt.. #mlb #redsox , justin turner pine tar

How Justin Turner gets the pine tar stain on his shirt.. #mlb #redsox , justin turner pine tar